Once it's frost bitten there is really nothing you can do except keep up with the vaseline and coat any other roosters you have. Make sure their coop is not drafty and not humid. The humidity is usually the problem with frostbite. Walmart sells a thermometer that shows humidity and the temp and is about $10.00
If the inside of your coop windows are freezing with a coat of ice or water is dripping on the warmer days you have a humidity problem. The next time you have decent weather shoo the chickens out into their run and lock them out while you turn their bedding over a bit. Try not to cause too much dust to stir up because that can cause respiratory problems. When I do this I leave the door open and the windows open till the dust disipates. Usually happens in 30 minutes or so.
Thanks for the info. The coop is fine, humidity wise. No fogging or anything. The dummies sit outside all day long, so I think that with the temps below zero with the windchill, that's what happened. My guineas and peafowl who all sleep outside (their choice they have houses) are fine so far. Crossing my fingers!
You have dummies also! I swear! When it's cold and windy out you would think they would want to be where it is a little more cozie. Not my girls. I have to make sure I don't let them out on the coldest days because I would have chick-cicles.