Announced November 20, 2018. The most recent information will appear after the large illustration and the introductory description from the USPS. In 2019, the Postal Service issues Frogs, four new stamps in a booklet of 20, featuring digital illustrations of four North American frogs: the Pacific tree frog, the northern leopard frog, the American green tree frog and the squirrel tree frog. Working with a primarily green color palette and touches of brown, artist Nancy Stahl captured the essence of each animal with enough important defining features to make each recognizable. Art director William J. Gicker designed the stamps.

Updated March 29th:
These stamps will be issued July 9th in Boise, Idaho.

From the June 6th Postal Bulletin:

On July 9, 2019, in Boise, ID, the United States Postal Service® will issue the Frogs stamps (Forever® priced at the First-Class Mail® rate) in four designs, in a pressure-sensitive adhesive (PSA) booklet of 20 stamps (Item 680100). The stamps will go on sale nationwide July 9, 2019, and must not be sold or canceled before the first-day-of-issue.

In 2019, the Postal Service™ issues Frogs stamps in a booklet of 20, featuring digital illustrations of four North American frogs:

• The Pacific tree frog,
• The northern leopard frog,
• The American green tree frog, and
• The squirrel tree frog.

Working with a primarily green color palette and touches of brown, artist Nancy Stahl captured the essence of each animal with enough important defining features to make each recognizable. Art director William J. Gicker designed the stamps.

Availability to Post Offices: Item 680100, Frogs (Forever Priced at the First-Class Mail Rate) PSA Double-Sided Booklet of 20 Stamps: Stamp Fulfillment Services will not make an automatic push distribution to Post Offices.

How to Order the First-Day-of-Issue Postmark:
Customers have 120 days to obtain the first-day-of-issue postmark by mail. They may purchase new stamps at their local Post Office™ or at The Postal Store® website at usps.com/shop. They must affix the stamps to envelopes of their choice, address the envelopes (to themselves or others), and place them in a larger envelope addressed to:

FDOI – Frogs Stamps
USPS Stamp Fulfillment Services
8300 NE Underground Drive, Suite 300
Kansas City, MO 64144-9900

After applying the first-day-of-issue postmark, the Postal Service will return the envelopes through the mail. There is no charge for the postmark up to a quantity of 50. There is a 5-cent charge for each additional postmark over 50. All orders must be postmarked by November 9, 2019.

Technical Specifications:

Issue: Frogs Stamps
Item Number: 680100
Denomination & Type of Issue: First-Class Mail Forever
Format: Double-sided Booklet of 20, (4 designs)
Series: N/A
Issue Date & City: July 9, 2019, Boise, ID 83708
Art Director: William J. Gicker, Washington, DC
Designer: William J. Gicker, Washington, DC
Typographer: Greg Breeding, Charlottesville, VA
Artist: Nancy Stahl, New York, NY
Modeler: Sandra Lane/Michelle Finn
Manufacturing Process: Offset
Printer: Banknote Corporation of America
Press Type: Alprinta 74
Stamps per Booklet: 20
Print Quantity: 200,000,000
Paper Type: Phosphor Tagged Paper, Block Tagged
Adhesive Type: Pressure-sensitive
Processed at: Banknote Corporation of America
Stamp Orientation: Vertical
Image Area (w x h): 1.05 x 0.77 in./26.67 x 19.558 mm
Stamp Size (w x h): 1.19 x 0.91 in./30.226 x 23.114 mm
Full Booklet Size (w x h): 2.375 x 5.743 in./60.325 x 145.872 mm
Colors: Cyan, Magenta, Yellow, Black
Plate Size: 800 stamps per revolution
Plate Numbers: “B” followed by four (4) single digits
Marginal Markings: Header. “FROGS Twenty First-Class Forever Stamps” • ©2018 USPS in peel strip area • Barcode • Promotional text in peel strip area • Plate number in peel strip area

Here are the first-day postmarks for this issue:The DCP cancel measures 2.78″x1.40″ The B&W Pictorial measures 2.58″x1.07″

Updated June 13th:

[press release]
Frogs Are Forever
U.S. Postal Service Celebrates Four Species with New Forever Stamps

What: The U.S. Postal Service issues Frogs, four stamps in a booklet of 20 that feature digital illustrations of four North American frogs: the Pacific tree frog, the northern leopard frog, the American green tree frog and the squirrel tree frog. The First Day of Issue event is free and open to the public. News of the stamp is being shared with the hashtag #FrogStamps.

Who: Tom Samra, Vice President, Facilities, U.S. Postal Service

When: Tuesday, July 9, at 11 a.m. MT

Where: Morrison Knudsen Nature Center
600 S. Walnut Street
Boise, ID 83712

RSVP: Dedication ceremony attendees are encouraged to RSVP at usps.com/frogs

Updated June 13th:

Background:
Frogs live on every continent except Antarctica; more than 90 species live in the United States, including the four on these stamps.

Found throughout the western United States, the tiny Pacific tree frog (Pseudacris regilla) is nicknamed the “Hollywood frog.” Countless television shows and movies have used its rib-bit, rib-bit call in nighttime scenes.

The northern leopard frog (Rana pipiens) is commonly identified by its highly distinctive call, a rattle-like snoring noise, followed by several notes described as “chuckling” or “clucking.”

Sometimes called the rain frog for its noisy choruses after a warm rain, the American green tree frog (Hyla cinerea) is also dubbed the cowbell frog for the sound of its short call when heard from a distance.

A raspy, quack-like call much like the scolding noise of a gray squirrel identifies the squirrel tree frog (Hyla squirella), found from southeastern Virginia through Florida and along the Gulf Coast to Texas.

Working with a green color palette and touches of brown, artist Nancy Stahl captured the defining features of each frog making them recognizable. Art director William J. Gicker designed the stamps. The Frogs stamps are being issued as Forever stamps and will always be equal in value to the current First-Class Mail 1-ounce price.

Updated August 7th:
Here are the Scott catalogue numbers for this issue:
5395 Pacific Tree Frog
5396 Northern Leopard Frog
5397 American Green Tree Frog
5398 Squirrel Tree Frog
a. Convertible booklet pane of 20, 5 each #5395-5398