Rock Clingers are incredibly cute creatures who have the tendency to fall in love with a Fraggle and never leave them alone. For that reason, Fraggles dread the Rock Clingers. These creatures were first featured in the Fraggle Rock episode "Uncle Matt Comes Home," when Uncle Matt follows one to find the Crystal Cavern, where the Rock Clingers live. At the end of the episode, when Matt has to return to Outer Space, he gives Gobo his Rock Clinger to cling on to while he's away, much to Gobo's horror. Oddly enough, Matt is the only Fraggle who actually enjoys the company of a Rock Clinger.

The Rock Clingers return for a cameo in the Fraggle Rock: Back to the Rock episode "The Twisty-Turny-Thon" during "Wind Will Guide You." A single Clinger appeared during the titular song of the episode "This for That."