The Eastern Narrowmouth Toad (Gastrophryne carolinensis) is a species of microhylid frog. It is found in the United States, from southern Maryland to the Florida keys, west to Missouri and Texas. While not a true toad, they are so called because they are terrestrial.
The Great Plains Narrowmouth Toad (Gastrophryne olivacea) is a species of microhylid frog. They are found throughout much of the south central United States from the state of Nebraska south through Texas, and into northern Mexico. Though not a true toad, they are often referred to as toads, because they are terrestrial.