Have you checked whether they are throwing feed into the bedding and wasting it?They are going through food like crazy
Have you checked whether mice or rats are eating some of it?
Of course you want to feed the chickens enough food, but there's no reason to feed the floor, or the rodents!
A common estimate is 1/4 pound per adult laying hen per day. So if you are buying more than double that much, it is almost certainly getting spilled, wasted, or eaten by something else.
If they are using a reasonable amount of food, the change might be because they are eating only the food you provide (while they are cooped up), as compared with finding some food elsewhere (at other times of the year.)
They do eat a bit more food in cold weather because they need more energy to keep warm, so that could also be part of the reason they seem to need so much now.
The lack of eggs is probably caused by molting or lack of daylight or both.and not laying eggs.
Waiting for a few months will usually fix either issue (the chickens finish growing their new feathers and start laying again, or the days get longer and they start laying again.)
As others have said, adding more light will help if lack of daylight is the issue, although you typically won't see eggs until several weeks after you start adding light. The hens' bodies need that long to get everything ready, and then they can lay an egg every day or two for quite a while.
Suggestions about fermented feed that freezes:because of the cold temperatures, the feed freezes if the chickens don't eat it fast enough. Any suggestions on this would be helpful!
--Put out small amounts several times each day, so the chickens eat up each portion before it freezes. If you leave dry feed available too, you don't have to be too fussy about getting the "right" amount of fermented feed, because they can eat the dry food if they're still hungry.
--Have two dishes of fermented feed, one being eaten/frozen in the chicken pen and the other thawing in the house. Switch dishes as needed.
--Put the fermented feed in a heated dish. If you also have a heated water source, this could save a lot of trips out to replace feed & water.
--It usually works best to let chickens nibble feed all day long. But it is possible for them to eat enough in two big meals per day (morning and evening) when the food is served wet or fermented. This is not ideal, but in bad weather it's helpful to know. For this to work, you would need to serve enough each time for them to all eat until they are completely full (and then the leftovers would freeze, and you'd have to thaw them out to use again later.)