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A Three toed tree toad is a wizarding species of toad.
Behind the scenes
"Three toed tree toad" is one of the possible answers to the question "If you were attending Hogwarts, which pet would you choose to take with you?" on the updated 2016 Sorting Quiz at Pottermore. All other answers are animals that you could previously purchase at Eeylops Owl Emporium and the Magical Menagerie (and that acted as the user's avatar) before the site was redesigned in 2015, with the exception of this, Snowy Owl, and Dragon toad.