The Giant bull frogs may reach an average snout to vent length of 9 inches for males and 5 inches for females. Some males have been known to reach a snout to vent length of almost 12 inches and 6 pounds in weight! In adults the dorsum varies from a dark olive green to a lighter olive color. In juveniles the light color vertebral stripe contrasts sharply with the dark green dorsum color. The stripe continues to diminish in intensity and usually fades completely by adulthood.
Males protect and care for the tadpoles until metamorphosis, digging trenches, allowing the tadpoles to swim to fresh pools when water or food supplies are exhausted. Metamorphosis usually coincides with the yearly termite hatch providing an abundant food supply for the newly metamorphosed froglets.