Depends what you mean by ‘fake tip’.  If they have posted an emote to make it look like they’ve tipped then the answer is no & its also against the ToS of Chaturbate to post fake tip emotes.

But if a user has actually tipped tokens then the only ways to send the tip back is if the user is verified for accepting tokens.  Otherwise they would need to get in touch with support@chaturbate.com with a valid reason why they wish to have a refund.