barker
noun
Definitions
Someone or something who barks.
Example: My neighbor's dog is a constant barker that keeps me awake at night.
A person employed to solicit customers by calling out to passersby, e.g. at a carnival.
Example: Bob had amassed a considerable stockpile of double entendres from his days working as a barker for a strip joint.
A shelf-talker.
A video game mode where the action is demonstrated to entice someone to play the game.
Example: The barker mode of the arcade video game convinced the teenager to spend a quarter.