Vanessa Hudgens does not sing the song "TikTok". The song "TikTok" is actually an instrumental piece of music used as the sound for the popular social media platform, TikTok.
It's likely you're thinking of a different song, perhaps one that Vanessa Hudgens *has* performed, or a song that is popular on TikTok. Could you provide more context or details about the song you're thinking of?