AnimalsAmphibiansFrogs & ToadsNarrowmouth Toads — Family Microhylidae
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Eastern Narrowmouth Toad —  Gastrophryne carolinensis [1,2]
Skin is smooth. Adults 2-4cm.
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Great Plains Narrowmouth Toad —  Gastrophryne olivacea [1,2]
Smooth skin. Adults 2-4cm.
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Northern Sheep Frog —  Hypopachus variolosus [1]
Evidence that species is found in Texas:
  1. The Center for North American Herpetology (CNAH), a checklist of the amphibians and reptiles of Texas based on works by Joseph T. Collins, Travis W. Taggart, and Roger Conant.
  2. Amphibians and Reptiles of Texas, James R. Dixon, Texas A&M University Press, 2000.