I have unidentified plants at my house which yield hops of an unknown variety. Actually I know what they could be, but have never formally tested them. I brew one batch a year with these hops, all flavor additions, since I have no way of knowing the alpha acids of each plant. First thing, when you get your hands on them, make sure they smell good. If not, don't bother. Second thing, avoid trying to use them as bittering hops, you don't know the alpha acids so it could be way to bitter or not bitter enough. Otherwise, brew them up. Ask yourself, do I like this aroma? if so, you will probably like them in the beer. Fun experiment. They may not of held up well in the freezer with out proper drying, so you'll have to see. Your not going to save any money brewing with poor quality hops. Sláinte.