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Since it's frozen, there is nothing you can do. It won't accept any more commands. Only hope is, If the Auto Recover or Auto Save is turned on already, the contents of the document should be saved on a temporary file. So just Force Quit Power Point and open it again. Power Point will automatically opens the document.
Press Command(Apple) + Option + Esc keys and this will bring Force Quit window. Select Power Point in there and click Force Quit.
If Power Point didn't open the document, then goto Documents/Microsoft Userdata/Office 200x_ AutoRecovery/
folder (x is version number)
You can find all the recovered documents there. If you can't find your documents there, I'm sorry they are lost.
If you can't force quit, then you will have to force turn off your Mac. Press and hold down the Power button until your Mac turns off. Turn it back on.
Please let me know if you have any questions. Don't Rate my answer until you are satisfied. Please don't rate my answer as Bad or Poor Service if you are not satisfied.