narrow-mouthed toad, any amphibian of the family Microhylidae, which includes 10 subfamilies and more than 60 genera and more than 300 species. Narrow-mouthed toads are found in North and South America, Africa, Asia, and Australia. Many are small, stocky, and smooth skinned with short legs, small heads, pointed snouts, and narrow mouths. They live on land, underground, or in trees and are generally secretive in nature. Most species are less than 8 cm (3 inches) long.

The eastern narrow-mouthed toad, Gastrophryne carolinensis, is a small, terrestrial microhylid of the United States. It is gray, reddish, or brown with darker stripes, spots, or blotches. The Mexican narrow-mouthed toad, or sheep frog (Hypopachus cuneus), is similar but is larger and has a yellow stripe on its back. It hides in burrows, pack rat nests, or, as does the eastern narrow-mouth, under objects lying on the ground.

A variety of microhylids are found in Asia and Africa. The genus Breviceps (rain frogs) includes a number of plump, short-faced, African species. These live and breed on land. B. gibbosus is a burrowing South African form that is traditionally thought to control the coming of rain.

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Among the Asian microhylids are Glyphoglossus molossus, a pug-nosed native of southeastern Asia, and Kaloula pulchra, a frequent visitor to gardens in Indochina. The African genus Phrynomerus (sometimes separated as the family Phrynomeridae) includes about five species of arboreal frogs; P. bifasciatus is a black and red, striped form whose skin secretions are strong enough to irritate human skin.