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Butternut is the name of the yellow colored Baby Talking Tattletail. In the first edition of the game (pre-Kaleidoscope update) he is one of the Tattletails that plays Hide-and-Seek with the protagonist.
NightNight is a black Tattletail seemingly in adoring fashion to the Tattletail Roleplay by GiantMilkDud. They were introduced in The Kaleidoscope Update