Tattletail is a toy who first appears in Christmas 2017: Mariotail.
When Mario was looking at presents he unwraps Tattletail. He quicking becomes obnoxious. On the last day, he and his friends gathered around a satan star. Mario quickly destroys the tape and all the Tattletails shut down. Mario tells his Friends that he sneaked into the basement and opened his gift early. SMG4 tells him that the Tattletail was Toad's present.