He is a muscular lavender fish with light purple spots and a light blue fin. He wears a yellow one-piece suit with a black belt and a white sailor hat. He has an underbite and large jagged teeth, though these teeth are actually a pair of dentures due to his age. In "Demolition Doofus," he got injured and had to move around on a gurney in a pipe-like object.
Role in series
"Shell of a Man"
Jones is present at the Navy Festival, reuniting with his old friends, including Mr. Krabs. At the end of the episode, he admits that his chompers, which gave him his nickname, are different from the ones he had in his Navy days.
Despite suffering an injury during the Demolition Derby and having to stay nearly immobilized during his recovery, he still battles the other injured Derby members at the hospital. Seeing him and the other injured Derby members fighting gives Mrs. Puff the idea to put SpongeBob in the Derby.
He is one of the muscular fish who sneak into Larry's Gym to watch the underground arm-wrestling tournament, and later loses to Mr. Krabs in an arm-wrestling match.
In the end credits of "Shell of a Man," his name is spelled as "Lock Jaws" instead of "Lockjaws."