Greg,
Yes, there is a difference. When the wood is frozen the hinge is less effective. The wood has more of a tendancy to pop.
Most times this doesn't make any difference. There have been times, especially in elms, where I'll get used to the hinge wood popping when I'm directing a chunk in the tree. the timing of the bypass cut is critical to get the chunk to make enough rotations to land flat, on end or whatever. Then, in the afternoon when things have warmed up the hinging characteristics change. Less of a pop and more of a normal hinge. In the morning the elm will pop more like red oak. Red oak will pop with almost no back cut.
I've seen this and talked about the freeze effect on hinging wood with other snowbelt arbos. This becomes almost an art. When I'm making the face or kerf cut I pay close attention to the feel of the saw. Frozen wood cuts differently than thawed. This is another one of those micro details that only come with paying attention and making mental notes.
A good example of this phenomenon that any chainsaw user has experiece with is the difference between live and dead wood hinges. The spectrum between the two markers is wide, the same as with frozen wood.
Tom