Originally Posted by
zerozero
Former bush pilot here.
There will be no reference for that sort of "tribal knowledge". It's sorta sounds like an urban myth, but it came out of the bush.
Logically, frost collects (and adheres) on cold surfaces. If it's NOT adhering then it's called FOG.
Yes.
All I can find says hoarfrost forms exactly the same as frost, except higher humidity leads to bigger crystals extending further off of the surfaces.
Freezing fog is the same as freezing rain, it's just fog that freezes instantly when it touches a surface.
Ice fog is ice crystals suspended, these may "fall" to the ground and not adhere. Ice fog IS a common occurrence in the North latitudes, but pretty obvious and blows off rather quick.