Chud

The Chuds are a group of humanoid monsters Finn and Jake encounter in a cave in the Desert of Doom.

Appearance
They resemble old men wearing rags with no eyes, fangs, and blue tongues.

Trivia

 * They are named "chuds" in the character design documents, a reference to the monsters in the 1984 horror film C.H.U.D. which stood for "Cannibalistic Humanoid Underground Dwellers".