I think you should let the teacher know before the presentation that you are nervous because you stutter. Then do your presentation, speak your part. If it goes well then great! If it completely tanks, you have already let the teacher know why and they may assess you differently. It would be nice if we could always pass the work to someone else, but life doesn’t work that way. You not speaking during the presentation robs you of practice. You doing all the behind the scenes work in order to avoid speaking, is unfair to you. It also robs your peers of practicing skills you should all be using. Im sure they are delighted you did all that work and appreciate it, but it doesn’t mean you did them a favour.