huckster
noun /ˈhʌkstə(r)/
  /ˈhʌkstər/
(old-fashioned, North American English)- (disapproving) a person who uses aggressive or annoying methods to sell something
 - a person who sells things in the street or by visiting people’s houses
 
Word OriginMiddle English (in the sense ‘retailer at a stall, hawker’): probably of Low German origin.