Depending on how you want to look at this (and with this I mean, whether or not you want to count an entire family as “mutation”), there are Tailed Frogs or Ascaphidae.
That being said, i don’t know enough about Frogs to answer whether or not there is actual research (or rather evidence) other members of the Order [Anura]() have documented tails in adults. I mean my kneejerk reaction is that there is no real reason why such mutations couldn’t exist… but that doesn’t mean i actually “know it”.
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Depending on how you want to look at this (and with this I mean, whether or not you want to count an entire family as “mutation”), there are Tailed Frogs or Ascaphidae.
That being said, i don’t know enough about Frogs to answer whether or not there is actual research (or rather evidence) other members of the Order [Anura]() have documented tails in adults. I mean my kneejerk reaction is that there is no real reason why such mutations couldn’t exist… but that doesn’t mean i actually “know it”.