The unnamed father is a fish who appears in two episodes.
His body is dark yellow and has orange lips, with scarlet red stripes on his arms and legs. He wears a light purple tie, a white shirt, a brown belt, and light brown pants. He also has gray hair and is balding.
In his first appearance in the episode "Toy Store of Doom," he is seen carrying his son away when the Toy Barrel is closing. In "A Day Without Tears," he is seen on TV and shown going to work but is stopped by his kid asking if he could play a game of catch. He first refuses to but then stays for a few throws.
In both of his appearances, he is seen with two different kids. That might be possible, because he makes his second appearance in a TV show, so that might be an actor.
The only time he is heard speaking is in the episode "A Day Without Tears."