A frohawk is an African-American hairstyle worn predominately by men. The Frohawk can be characterized as somewhere between a flat top and a mohawk; they are usually worn short, but fairly wide. Frohawk's are currently very popular despite the impracticality of the hair-do.
Joey got a Frohawk because Dante, Mike and all the other guys on his team had them. He should have gotten The Frederick Douglass because it's way more fly AND practical. He wouldn't have to shave off a Frederick Douglass for his office job this summer.