Exactly! without a big focus, they can be ANY of the things you listed. Also, the Nature's Child ability lets you specialize your Changeling to have one of the listed focuses (if you want).
Yeah, I thought about a bunch of names, and wanted to call it the Shifter or Shapeshifter, but those were taken.
Manimal sounds stupid, but Zaomorphs seems kool.
persnally, I like the (you can only shift to animals you'v seen" rule, If the player types up a good history, and spens a lot of time in the wild, they will have a pretty nice selection.
-Jeph