Croagunk resembles a dark blue bipedal frog, with white bands around its waist area that resemble bandages and red and black markings on its hands and feet. Its colouring and poisonous nature suggest that it is based on poison dart frogs. The markings on its body make it look like a Muay Thai fighter, and its jutting teeth make it appear to be wearing a mouthguard. The black around its eyes and the white bands make it look like an injured fighter with black eyes and broken ribs. Its orange cheeks are filled with a poison that runs to its fingers, allowing it to poison opponents by stabbing them.