Though it isn't the best decision because of lack of accuracy and strength, you are allowed to contact the ball with your head. This generally happens when someone is digging; the hit comes so fast and the digger doesn't have time to react, resulting them getting hit in the face/head. The ball can still be played off their hit. Usually players don't try on purpose to do this.
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Yes, you can play a ball off of your shoe or head, but it can not be intentional, and it probably wouldn't work well anyways... hope i helped! :)