A terrapin is a term for a turtle that lives in freshwater or brackish water, distinguishing them both from sea turtles and from land turtles (including tortoises). The term does not necessarily imply any particular subspecies of turtle—merely any turtle whose natural habitat is as described.

In the Teenage Mutant Ninja Turtles multiverse, most incarnations of the Turtles mutated from a species of terrapin (originally the red-eared slider). The Turtles are sometimes referred to as "terrapins" in a florid or poetic sense, as the word "terrapin" tends not to be a casual everyday word in the English language.

In the Mirage continuity, the name of Terrorpin is a pun on the words "terrapin" and "terror."

In the IDW continuity, Baxter Stockman developed the Terrapin/Human Exo-Armor Synthesis for General Krang's Stone Soldiers, using the originally non-mutant Turtles as a source of biological material.

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