What is the name of the youth organization that Huey, Dewey, and Louie belong to?

Huey, Dewey, and Louie belong to the Junior Woodchucks.

The Junior Woodchucks are a fictional scouting organization in the Disney comics and DuckTales universe. The triplets carry a guidebook filled with practical information, and their scouting skills frequently help them solve problems during adventures with Donald Duck and Scrooge McDuck.

Carl Barks created the organization in the 1951 story “Operation St. Bernard,” published in “Walt Disney's Comics and Stories” #125. Its stories mix outdoor skills and badges with environmental protection, animal welfare, science and international cooperation.

The boys are sometimes simply described as scouts, which can lead readers to confuse the Junior Woodchucks with real-world groups such as the Boy Scouts of America. In the original DuckTales series, all three are associated with the organization. The 2017 reboot changes the arrangement: Huey is the clearly identified Junior Woodchuck, while his brothers follow different interests.