Indeed he has, as is proven in the picture displayed below this text. Whether Chuck D has entered into an endorsement agreement with Adidas is another question that I do not have the answer to. RUN-DMC, alongside the Beastie Boys, are the 80's Hip-Hop artists most synonymous with Adidas; Adidas having released a RUN-DMC version of the Superstar sneaker in the late 1980's. As you will be aware, Chuck D was the leader of Public Enemy; a rap group, founded in 1982, that also featured Flavor Flav, Professor Griff, Khari Wynn, and DJ Lord. Public Enemy were founded in New York City, which was also the case with the Beastie Boys and RUN-DMC; so, it would seem logical that Adidas would have approached Chuck D and Public Enemy to enter into an endorsement contract; whether this is the case, I don't know. What is certain: is that Adidas' marketing campaign in North America has relied heavily on official and unofficial endorsements from Hip-Hop and Rap artists since the early 1980's.