Poobahs

From Muppet Wiki

The Poobahs are a secret, silly society on Fraggle Rock. Among their solemn, time-honored traditions are calling each other "Fritz" and requiring potential new members to recite an oath in the "Uffa-fluff" language. In the Fraggle Rock episode "The Secret Society of Poobahs," Mokey desperately wants to join their organization.