Plains Leopard Frog
The plains leopard frog is medium-sized, with a light tan ground color and numerous rounded spots on the back. The spots can be brown or greenish brown and are not ringed with white. There is always a distinct white line along the upper jaw. The tympanum (rounded ear spot) has a white spot in the middle. Often has a dark spot on the snout, and the belly is white. Underside of legs and groin area is pale yellow. The ridge of skin along each side of the back is broken toward the hind end, with a small section at the rear raised toward the back. Call is a rapid series of guttural chuck-chuck-chuck sounds, with a pulse rate of three per second.
Similar species: Missouri's two other leopard frogs and the pickerel frog all lack the distinctively broken and displaced skin ridges along the back.