Unless you have Muscovy's about the only place you'd find frost bite is on your ducks feet. and that doesn't happen often but it can happen, last year we had a member who rescued a little call duck that got frozen in a water dish he eventually lost his one foot. My one Muscovy drake has frost bite on his knob of flesh above his bill, I am watching it close and so far no infection. Winter this year so far hasn't been anything last like years which I am very grateful for.
Wondering, how do you store your duck egg's?