Pufferfish are members of the Tetradontidae family are refers to the four large teeth that resembles a beak. They have the ability to inflate to a large size when threatened. They develop great personalities and so are popular aquarium fish.
Boxfish have an odd appearance and can be in the shape of a box or triangular pattern. They have a strong rigid outer body and have somewhat of an odd swimming pattern
Cowfish are similar to boxfish in have a riged outer body and a box like appearance. But cowfish develop large horns pretruding from their heads. They have the ability to blow jets of water in the sand bed in search for food.