I had some white fuzz on mine and planted them. Later, 2 of them grew white fuzz on the soil around the area the hops were planted. The stems got mushy and some sprouts died, while others did not. I moved the pots outdoors, and the fuzz started to disappear. Then the bines died from underwatering. I managed to get nearly all of them back though. They just seem to keep on growing!
I'd plant them and be careful not to over water them. Give them good sunlight and hope for the best.
I will mention that Freshops sent 2 more rhizomes to replace the ones that were growing fuzz. I think I only have 1 plant not growing at this time. One of the replacement rhizomes has not broken ground yet. I'm holding on to hope for it. The rest are growing at variuos rates, but not going gangbusters. I hope the additional sunlight kicks them in. I had to move them indoors for a cold snap last week.