fabulist
A person who writes, tells, or extensively studies fables.
That great fabulist and philosopher Aesop illustrated it by his fable of the bundle of sticks[…]
A liar.
figuratively
The Infowars fabulist has been funneling millions out of his empire while claiming bankruptcy, the Sandy Hook families suing him say.
Where it comes from
Borrowed from French fabuliste. By surface analysis, fable + -ist, or, by surface analysis, fabula + -ist. Compare fabular.
Adapted from the Wiktionary entry fabulist (CC BY-SA 4.0).