The first is an animation rough by Glen Keane; the others are unidentified. Anyone?
I'd hazard a guess and say that the second page, the drawings of Tod expressions just under Keane's, is Phil Nibbelink's. It reminds me strongly of drawings I've seen of his...but that's just a guess.
Again, these are posted artificially small here on the page; click them to open them and really see them at a better size.