Frogs are amphibians, and they often move by the water's edge. The appearance characteristics of frogs are quite prominent. Their heads are very flat, their shapes are triangular, their snout is pointed, their eyes are very big, and they are very prominent on their heads. In addition to some appearance features, they also have some special body structures, such as their tooth structures. Frogs have teeth in their upper jaws, but these teeth are different from those of most animals, and their teeth belong to vomerosal teeth.

Frog's teeth are not only different from those of many animals in appearance, but also quite different from those of other animals in function. The teeth of other animals have the function of predation and feeding, and when eating, the teeth will play the role of chewing. But frogs' teeth are different. When they hunt, they use their tongues and swallow their prey directly, instead of chewing it. Of course, teeth can still play a certain role when frogs eat, which can prevent prey from escaping from frogs' mouths.

From a general perspective, frogs belong to vertebrates, and they have spines. Specifically, frogs belong to amphibians, and one of the basic characteristics of amphibians is that they have hearts, and their hearts have two atriums and one ventricle. The same is true of frogs. They also have hearts, which are divided into atria and ventricles. The atria have two and the ventricles have one.