Just a silly question from a German dude: Why the heck do you want to freeze beer? O.o
Eisbock my fine German friend. Eisbock.
I guess I should clarify a bit more - Reinheitsgebot prevents Germans from adding simple adjuncts like sugar into beer. As such, it is very difficult to get an all malt beer up much past 10% alcohol. As an aside, this is why Belgian beers have a much higher ABV - they use simple sugars to boost the alcohol content.
Eisbocks are beers that are fortified by freezing and leaving behind the ice. The resulting beer complies with Reinheitsgebot. You would never drink it at freezing. That would be a terrible crime against any good beer (looking at you ryancrawcour). Eisbock is simply made this way and then processed like normal.
Being German, you have an excellent selection at your disposal. Some of them are well over 14%. Try one or two!