If you would like a 'frosted' window replacement, I'd recommend going to any window business for a tempered frosted replacement...the stuff is very strong. Just make sure it's tempered. Take the frame in and they can cut and install, usually in a day. I'd also use 'Butyl' tape for the re-installation of the frame...I've used it on sailboat thru-hulls...doesn't get hard and is definitely water proof, for a very long time.
BTW, most will have 'tempered' glass in clear as well.