konjac ( ; amorphophallus konjac; syn. "a. rivieri"; japanese: 蒟蒻/菎蒻; こんにゃく; konnyaku; ; gonyak; ), also known as konjak, konjaku, konnyaku potato, devil's tongue, voodoo lily, snake palm, or elephant yam (though this name is also used for "a. paeoniifolius"), is a plant of the genus "amorphophallus".