Barnebis is Prince Gristle's pet and a former supporting antagonist of Trolls. He is voiced by Mike Mitchell. He is ruthless, murderous, dangerous, lonesome, cranky, evil, feral, aggressive, wrathful, wild, bitter and savage. He likes being alone, King Gristle, sadness and eating. He dislikes the Snack Pack, Trolls, Poppy, glitter and being blind.
Barnabas appears to be a hybrid of a crocodile, a stereotypical Doberman and a komodo dragon. In the beginning of the movie he was a pup and by the end he appears to be fully grown. Barnabas made his first appearance when Prince Gristle was talking to his father about happiness. He has then seen again when King Gristle Jr. was saying that he was his only friend then again when Gristle was working out. He chased the Trolls out of the bedroom and down the hall after being blinded with glitter and tripping before consuming the gem and supposedly Creek. He later appears at the Trollstice celebration.
- Barnebis was always the supporting antagonist of the film, due to his smaller role because he chased the Trolls out of the bedroom and down the hall after being blinded with glitter and tripping before consuming the gem and supposedly Creek. Princess Poppy didn't defeat Barnebis, Guy Diamond did.
- Mike Mitchell recorded his growls for one minute.
- In the recording for King Gristle, Barnebis bit King Gristle Jr.'s finger after he said he was his only friend.