This is one of those things that you never even fathom happening till it happens in your coop! Frozen chicken 'hair'. Or topknots. Or just call them feathers....either way when temps hit zero or below, suddenly a little wet hair is a big deal!
Yes, those are ice drops frozen to the ends of her feathers! I noticed the problem last week when temps were in the negatives here in Western Pennsylvania. It mainly happened in the Silkie coop. The birds would lean down to drink water and their head feathers would dip into the water. This happens year round, however it's only a hazard in the winter. In the winter the wet feathers freeze. Frozen feathers are never a good thing! The solution was simple though...just trim the feathers!
Youngest son held the birds while I gave their hairdo's a quick trimming. A few of the roosters needed beard trims also. Feathers tend to wick the water toward the body and the last thing we need is for our birds to get wetter and colder then the should be....especially in this polar vortex weather!