I would say Shaq Daddy. He is seen all day long on every TV channel.

The General car insurance
Icy Hot
Gold Bond powder and/or lotion
Oreo - dunk challenge
Buick Lacrosse
Monster SuperStar Bluetooth Speaker

"The top 50 Shaq endorsements"
time to celebrate all he's accomplished in his career. Not his basketball career -- his other job, as a pitchman for, um, everything. I do not use this word lightly, but there is LITERALLY no chance you haven't purchased or at least used a Shaq-backed product. None.

https://www.si.com/extra-mustard/2015/03/06/shaqs-endorsements-ranked#

"Charles Barkley is tired of watching Shaq in commercials"
“He got a 100 of them,” Barkley complained. “Yeah he’s got too many endorsements. And you know he’s got the lotion. They show our commercials when we’re on television, so when we’re not on during the game we sit in the green room and he’s on every five seconds rubbing lotion on his fake body.”

Of course this isn’t the first time that Barkley has made a joke about one of O’Neal’s endorsements. Last month he joked that O’Neal’s soda was “spreading diabetes all across the world, as we speak. Got like 50 grams of soda in one can of that cream soda.”
https://ftw.usatoday.com/2014/04/charles-barkley-is-tired-of-watching-shaq-in-commercials