fakir

double-crosser, double-dealer

bluffer, charlatan, fake, faker, humbug, impostor (or imposter), mountebank, phony (also phoney), pretender, quack, quacksalver, ringer, sham

adventurer, fox, gamesman, knave, prankster, rascal, rogue

fast-talker, slick, slicker, slickster, slyboots, smoothy (or smoothie), wheeler-dealer

plotter, schemer, sneak, sneaker

blackleg, cardsharp (or cardsharper)

copycat, imitator, impersonator, mimic

actor, bluffer, counterfeiter, deceiver, dissembler, duper, feigner, misleader, operator, trickster

poseur

cozener, defrauder, dodger, fraudster [chiefly British], scammer, scamster, sharper, sharpie (or sharpy), skinner, swindler