Biological Miracle – Wood Frog

I really expected a wood(en) frog here, qualifying truly as a biological miracle. But the wood frogs are cool as well.

Oh god. This made me wonder, what is wood, anyway? And I've just come away much more confused.

Bamboo is a grass and doesn't come from a tree. Palm wood comes from palm trees, except palm tree trunks are apparently a totally different type of structure than other tree trunks, sounds closer to Papyrus. No growth rings, a fiber type structure. Is Papyrus wood?

Any plant matter above a certain density? I don't think that's it. Corn stalks aren't wood.

Man, I don't know. I am certain that it must be plant matter though, so yes, a wooden frog would be a biological miracle.