My kids are trying to recall a movie that goes something like this?? A pig was trying to find his mom in a tree house with a dungeon and a spiral staircase. They also came up with the following thoughts about the movie: whale, round house, ice rink, library, spells, witch, forest. Sounds bizarre, I know, but any help would be appreciated. They would have watched the movie in the mid/late 90's.

I don't know maybe the black cauldron?

Possibly The Pagemaster