The Collaborative International Dictionary of English v.0.48:

Hoaxer \Hoax"er\, n.
   One who hoaxes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hoaxer
    n 1: someone who plays practical jokes on others [syn:
         prankster, cut-up, trickster, tricker, hoaxer,
         practical joker]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "hoaxer":
   Artful Dodger, Casanova, Don Juan, Machiavel, Machiavelli,
   Machiavellian, actor, bamboozler, befuddler, beguiler, charmer,
   counterfeiter, deceiver, deluder, dissembler, dissimulator, dodger,
   double-dealer, duper, enchanter, entrancer, faker, fooler, forger,
   gay deceiver, hypnotizer, jilt, jilter, joker, jokester, kidder,
   leg-puller, mesmerizer, misleader, plagiarist, plagiarizer,
   playactor, practical joker, ragger, role-player, seducer, spoofer,
   tease, teaser