Boxish Fish Posted on May 16, 2007 by Anna Some fish are shaped like bread boxes. How silly! A freshwater Puffer. Their little fins flap so quickly, they look like little bumblebees swarming around the tank. Boy do I want one of these! An aptly named Boxfish. A BABY Boxfish! And the silliest of all is the Cowfish. He thinks he is a cow, but please don’t try to milk him.