Every turkey hunter needs a call they can use discreetly, when the birds are closing in. A mouth call or the "one finger" push-button call Mickey mentioned works great.
Don't be afraid of, or give up on, the mouth calls. We all spend lots of time in our cars, which is a great time to practice with the mouth call, and no one is going to laugh at you... if you're alone!
When you're set up in the woods and you use both, you can mimic a little "turkey commotion action" by using both at once with minimal movement.