The adult male frog is 48.1 to 60.8 mm long from nose to rear end and the adult female frog is 65.0 to 75.2 mm long. It is named after its large, bony head, which looks like a hat or helmet. The adult male frog is olive green. The adult female frog is light brown or green-brown. There are dark brown or black marks on the back and legs. Some frogs have silver marks on their backs and head. The frogs have yellow color on their sides or red brown on their back legs. The belly is white and tan.