Jawz

Jawz (known as Jawzun in Japan) is a shark-like Badnik that appears in Hydrocity Zone in Sonic the Hedgehog 3. It will swim around in straight lines, but make no particular effort to attack the player. Nevertheless, they can be dangerous if the player is caught unaware.

Jawz has a similar attack pattern, but very different appearance to the similarly-named Jaws from Sonic the Hedgehog.

Trivia
In Sonic Labyrinth a Badnik named Ototo who is similar to Jawz.