Jokes aside, the Tin Man was too brutal to be a superhero. The Wizard of Oz, the book, is an extremely violent opus.
But if we're doing materials:
I got a wooden whistle and it wooden whistle.
I got a lead whistle and they wooden lead me whistle.
I got a steel whistle and they steel wooden lead me whistle.
I got a tin whistle and now I tin whistle!