Rump People

The Rump People make an appearance in the episode Freak City.

Appearance
Their heads are shaped like buttocks, hence their names, Rump People. The Rump People hate the Freaks, which include Gorflax, Gork, Kim, Trudy, Wee Wee, Zap, and Finn. Every time they see one, the throw them under a bridge, known as Freak City.