Not an expert in the freezing thing as it was in the mid-80's out here when the rest of the country is really struggling with the cold. But I think lightly tapping the glass to break any seal the window might have made with the rubber seal wouldnt hurt and as you pull the handle, see if the window goes down a bit. even if it doesnt go down it really wont hurt things much but there is really one way to find out. One thing I am sure of that car manufacturers test their cars in extreme cold and heat before they are put out there so Im sure this has been addressed by the factory and warranty should cover any problems.
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