There are multiple false prophets mentioned in Tanach. See, e.g., Yechezkel 13, condemning the false prophets and Melachim Aleph 22 in which Achav gathers many neviim that give a false prophecy that he wants to hear.
And you don’t get to be a navi in the first place until you successfully pull off a neis or an accurate prediction. On the other hand, I don’t know if there are any (beyond the nevei ha’baal but they didn’t pull of a real miracle) who were advocating avoda zara.