pitchman

noun, plural pitch·men.

1. an itinerant vendor of small wares that are usually carried in a case with collapsible legs, allowing it to be set up or removed quickly.
2. any high-pressure salesperson, as one at a concession at a fair or carnival.
3. a person who delivers a message on radio or television, as for a product, cause, etc.

noun plural -men US and Canadian

1. an itinerant pedlar of small merchandise who operates from a stand at a fair, etc
2. any high-pressure salesman or advertiser

n.1926, American English, from pitch (n.1) in the sales sense + man (n.).