It's the season of giving ... and Joel McHale really wants to give Raiders owner Mark Davis a new haircut ... 'cause the comedian says his current 'do is actually a DON'T.
TMZ Sports ran into McHale at The Grove when he started talkin' football and his beloved Seahawks ... which eventually turned into an impromptu roast of Mark Davis.
Davis has been rockin' the hairdo forever ... but McHale says if he's ready to make a switch, he can be Mark's guy.
