Frogs and bullfrogs are not the same thing, they are just a subspecies of frogs, and there are still many differences between them. Frogs are usually 70 to 80 millimeters long, and males are slightly smaller, while fieldfares are a bit stouter than frogs. Frogs breed from April to July, and usually begin to chirp to attract females before and after the rains and at dusk, while fieldfares breed from May to August, and they begin to reproduce immediately after hibernation.

Fieldfares are generally referred to as tiger frogs. Tiger frogs are a family of forked-tongue frogs. It is large, 66 to 98 millimeters in length for males and 87 to 121 millimeters for females, and can weigh up to about 250 grams. Tiger frogs often live in paddy fields, ditches, ponds, reservoirs, swamps and other watery places below 900 meters above sea level, and their habitats change with different life periods such as foraging, breeding and overwintering. The tiger frog is a carnivorous animal, which mainly feeds on locusts, butterfly moths, dragonflies, beetles and other insects in nature.

The bullfrog belongs to the amphibian class, anuran order, frog family, is a large edible frog, its meat is tender, flavorful, nutritious, and has a certain medicinal value. Bullfrog, commonly known as the American water frog, individual large, fast-growing, high-yield, native to the North American region, has been throughout the world's continents, is the main breeding species of edible frogs around.