It's probably happened more than once in college football. 2-0 is the score recorded when a game is forfieted. This weekend Smite was kicked out of the high school playoffs for a fight in their previous game. I saw that their opponent for this game won 2-0.
Probably right that it's happened more than once; especially when forfeit are involved, but I was more interested in games actually played that ended in that score. The Mich-Chi game was all I could find.