In flag football, you generally don't have linemen in the traditional sense; there's no blocking allowed, and the quarterback is protected by a count instead of his blockers.

The American Flag Football League is one of the organizations trying to take over this space (they recently played a game in Levi's Stadium with Michael Vick and Terrell Owens, among others). Here are the full rules if you're interested! https://www.americanflag.football/official-rules/.