Grubby Grouper is a fish who only appears in the episode "Bubble Buddy."
Grubby Grouper is an old washed up dark green fish. He is covered in dirt and flies. He wears an orange hat, a white tank-top, and has a lot of yellow stubble on his face. He drives an orange boatmobile with wood panels on the sides and a teal patch at the front. In his cargo is a purple surfboard with yellow fins and a yellow stripe going through the middle. He has what looks to be a hat with stitches on it.
He is a famous surfer and confronts Pearl and her friends while in his boat. He shakes his dirty hand with Pearl, and she says that she will never wash the fin again. He then howls and drives away. Shortly after, Bubble Buddy shakes hands with Pearl, cleaning her fin and causing her to cry.