Doug Vaccaro is an actor who portrayed "Chip, the wisecracking assistant" on a sitcom named Toolin' Around. He is a current spokesman for Mom & Pop Hardware, and encourages customers to buy a barbecue pit. Inspired by his suggestion, Homer Simpson bought the former product.
Doug is presumably based on actor Richard Karn who also appeared on a sitcom at the time. Karn played as Al Borland, co-host of the series Tool Time with Tim Taylor on Home Improvement.