[TOMT][BOOK]Children's book from mid-2000s (likely much earlier)

I remember listening to an audiobook of this when I was a teenager, so this might date back to the 90s or earlier. The only thing I remember about it was that towards the end, a scarecrow character was standing trial for a crime, and attempted to use the Ship of Theseus as a defense that he was not the same being who committed it since so much of his body had been replaced over the course of the story.