It is featured on Peepthatshit.com in the "Hip Hop" section, as well as on a billboard in Algonquin. Fruntalot is most likely a parody of FUBU. The motto "Just say you did it" is a clear reference to the Nike's "Just Do It", another possible inspiration for the company.
The person pictured on the billboard in Algonquin has gained notoriety among players, since he bears a striking resemblance to Carl Johnson, the protagonist of Grand Theft Auto: San Andreas. The purple Fruntalot hat is sold in Sub Urban and Discount Store stores in GTA Online.