The Pipebangers

From Muppet Wiki

The Pipebangers are a group of Fraggles whose responsibility it is to bang the pipes in Fraggle Rock with sticks, an action which they believe makes water run into the Fraggle Pond. They wear vaguely pickle-shaped headgear and carry banging sticks. Led by the Archbanger Fraggle, they appeared in the Fraggle Rock episode "Let the Water Run."