A bullfrog is not a frog. But both it and frogs belong to the class Rana. Frogs mainly refer to amphibians without tails such as frogs and toads. They belong to the phylum Chordata, subphylum Vertebrates, subphylum Amphibians. The skin on the back of bullfrogs is relatively flat, while the skin on the back of frogs is relatively smooth. It is rough and has dark markings on its body.

The female's eardrum is about the same size as the eye, while the male's is significantly larger than the eye. The folds run from behind the eyes around the top of the tympanic membrane to the armpits, especially in males. The fourth toe is very long, and the web cannot fully reach the end of the toe. Body color often varies greatly depending on the region. The back color ranges from green to brown, but is mostly green. Usually mixed with brown spots, sometimes with gray or brown reticulated patterns. The ventral surface is white, sometimes with gray spots, and there are often yellow stripes on the throat of the adult.

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The skin color of bullfrogs and frogs is also different. The back color of bullfrogs is mostly green with small black spots. Some have a brown background with black spots. Frogs have different colors and varieties. There are differences between tiger frogs and frogs. The color of tiger frogs is the same as the tiger's stripes. The background color of the body is not like the bullfrog, whose entire back background is brown or green. , the shading color is different on the head and body.

In fact, there is a big difference. Even when a bullfrog is a child and a frog of the same size is together, there is a difference and it is easier to distinguish them.

In addition to the differences in color and size, the calls of bullfrogs and frogs are also quite different. The calls of frogs are much crisper and quieter, while the calls of bullfrogs are low, loud and vibrating. It sounds like a cow, so the bullfrog got its name because its cry sounds like a cow. Hearing the cry from a distance is completely different.