A Huckster

1. A peddler or hawker, who sells small items, either door-to-door, from a stall, or in the street.
2. Somebody who sells things in an aggressive or showy manner. https://en.wikipedia.org/wiki/Huckster
3. One who deceptively sells fraudulent products.
4. Somebody who writes advertisements for radio or television.
5. A mean, deceptive person.