Try "Ghost of Tom" in the DT. The note says it's a four-part round, but (oddly enough, considering that I was just discoursing about canons in this forum), our elementary-school class also sang it as a canon by augmentation: while some kids sang it through twice, others sang it once at half speed.

As I recall, I didn't like the last line of "The Ghost of Tom". Do kids really like modern sort-of-funny Halloween songs like "The Wobblin' Goblin", or would they rather sing something gruesome or scary? Try searching the DT for @ghost, @witch, etc. Don't forget "Tam Lin".

Judy, if your pre-schoolers like that "stirring the pot" chant, try them on the witches' spell from Macbeth. You obviously don't need any amateur suggestions I could come up with on visual aids or gestures.

We always sang "Over the River and through the Woods" at Thanksgiving, not Christmas. Maybe it depends on what part of the country you're in. "White and drifting snow" is possible (though not all that likely) in Cleveland in late November.