The Bullfrog's snout-vent length ranges from 9 to 15 cm (3.5 to 6 inches). Its back and sides are some shade of green or brown and occasionally there are some darker blotches or spots on the back. The belly is off-white and the chest is mottled with gray. The skin is smooth and slimy. There are no dorsolateral folds along the frog's back. Instead, a ridge on each side of the head curves around the tympanic membrane from behind the eye.