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Klingon octopus

A plate of Klingon octopus

Klingon octopus was a type of aquatic lifeform native to Qo'noS that was commonly served as a food dish. (TNG: "Genesis", "A Matter Of Honor").

Whether the Klingon octopus has eight arms or not is speculation, however, what is more likely true is that it is some form of sea mollusk.