Dave Carp Five
From Muppet Wiki
Dave Carp Five is a band of five fish wearing Sgt. Pepper clothes who sang "Hey Food" (not the Sesame Street version) and "Like a Sturgeon" in the "Let's Eat Infomercial" sketch on Episode 112: Food of The Jim Henson Hour. They were a parody of the Dave Clark Five. Some of the members included one of the Gills Brothers, a red fish who sang Splish Splash, and the puppet who would become Ernst Stavros Grouper on Muppets Tonight.
