Personally I either use them fresh or dry them so I don't have experience with freezing wet hops. I recommend drying them by whatever means possible. I have used a window screen, dehydrator, and oven. I used the oven at 150 F for many years. However the oven removes basically all of the aromatics. Dehydrator works better, and the screen worked the best for me but takes the longest and requires the most space.
I think you could get away with freezing wet hops for a short time, say a few months. But if storing for much longer up to or going past a year, I would be concerned they would begin to taste freezer burned and give bad flavors to the beer, defeating the purpose.