We had big combed birds when I was young and we did nothing. Old timers that have shown birds swear by the ointment thing.
I try to imagine if I was out in the cold with no gloves - would my hands be warmer dry or with vaseline. I don't know.
IMO the application of vaseline or whatever helps more from the massaging of an area that is full of blood vessels rather than what is covering them. Vaseline, after all, isn't a very good insulator.
I could never catch my roosters long enough to apply anything, much less daily.
I do nothing for the frostbite unless it gets infected (it hasn't happened to me), then you should dub.
Unless you keep the birds confined in cold weather and heat the coop, open the windows and get the humidity out.