Croaks are a type of mutated human. They are never described in great detail but it is known that they are tall, bulky and have clawed fingers and move with a stiff, shuffling gait that makes them slower than a regular human on flat ground. They generally live and hunt in packs and sometimes come into conflict with lizards due to both having the same predatory feeding habits. Croaks, unlike lizards, are violent and dim witted by nature and will often attack humans and other mutants on sight.