Frog
A frog was a tailless amphibian found on several planets, including Earth. A toad was a type of frog adapted to dry environments.

During anomaly consolidation duty on the  in 2381, Ensign D'Vana Tendi found the skull of a large frog from a planet "where everything evolved all weird" in Commander Jack Ransom's office. The skull began to glow and shake when Ensign Sam Rutherford picked up its sample container with tongs, causing him to drop and break it. The broken skull then exuded a vapor that triggered full molecular engorgement in Rutherford after he inhaled it. ()

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Animals