The Collaborative International Dictionary of English v.0.48:

chiseler \chiseler\, chiseller \chiseller\n.
   1. a person who swindles you by means of deception or fraud.

   Syn: swindler, chiseler, gouger, sharper, sharpie, sharpy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chiseller
    n 1: a person who swindles you by means of deception or fraud
         [syn: swindler, defrauder, chiseller, chiseler,
         gouger, scammer, grifter]