snake oil salesman

noun2

1. •
   A swindler or grifter who sells worthless or fraudulent remedies, cures, or solutions such as snake oil, often an aggressive or showy manner.

   • She was dubbed a "modern day snake oil salesman" after she managed to swindle over thousands of internet customers.
2. •
   One who deceives people in order to obtain money from others: fraud, scammer, charlatan, huckster, conman.