Forget first downs ... Aaron Rodgers is all about Daily Doubles now -- 'cause the NFL star just revealed he's going to be a celeb guest host for an upcoming "Jeopardy!" episode!
The Green Bay Packers QB made the announcement on Pat McAfee's show Tuesday ... saying it's a hell of an honor for him since Alex Trebek was one of his childhood heroes.
"One of my idols growing up was Alex Trebek," Rodgers said ... "They're doing some guest hosting spots and it's going to be released here pretty soon, but I have the opportunity to do one of those.