The Japanese forest frog (scientific name: Rana japonica) is a species of amphibian in the family Ranidae. Male frogs have a body length of 34-59mm, while female frogs have a body length of 39-67mm. Head length is greater than width; The snout end is blunt and pointed, located in the lower jaw. The snout edge is blunt, and the cheek is slightly inclined outward. The cheek surface is concave, and the nose is located between the snout and eyes. Near the snout end, the distance between the eyes is smaller than the distance between the nose, and the temporal folds are thin and weak. The eardrum is large and round. The plow bone teeth are located between the internal nostrils, sloping backwards towards the midline without touching each other. The tongue is oval in shape, with a free posterior end and deep incisions.