He is a dark teal fish with faded blue lips and light orange fins. He wears a white tank top/sleeveless shirt and red shorts.
He first appears in the episode "Ripped Pants," where he rushes to save SpongeBob after the latter had crashed down with a wave and washed up on the beach. He was not amused to find out that he had faked the fall for his enjoyment.
In "Bubble Buddy," the beachgoers push his lifeguard stand over.
He is seen as a lifeguard again in "Sand Castles in the Sand" when Patrick, trying to catch a Frisbee thrown by SpongeBob, runs into the lifeguard stand that Frank was on, causing it to crash to the ground, making Frank angry at the duo's idiocy.