Morty the Troll is a sewer troll who appears in Keeping Shop. He is a friend of Fu Dog's, yet was very tough on him as Fu had failed to pay back his money.
- Fu Dog: "Don't touch anything, don't open any drawers, and if a big toothless guy named Morty shows up saying 'Where's the money?!' Tell him I moved it in the machoo peetzoo, got it?"
- Spud: "I'm sorry. I guess I wasn't paying attention. Oh, and I forgot to tell you, a friend of yours stopped by. Come on in, Morty."
- Morty: "Where's the money?!"
- "Keeping Shop" (Only appearance)
- Fu Dog said that Morty is toothless, but when he says, "Where's the money?", he has teeth.
- He is voiced by Dee Bradley Baker