{{Infobox Song |image = File:TheyDontKnowmusicvideo.jpeg |name = They Don't Know |singer = Ariana Grande |preceeded by = I'm Coming Out/Mo' Money Mo' Problems |followed by = True Colors "They Don't Know" is a song from Trolls. The song is performed by Ariana Grande. It played during the roller skating at Starfunkle's while Bridget (as Lady Glitter Sparkles) and Prince Gristle skate and dance, at the Trollstice, The trolls give Bridget her own skate back.