Frau Holle? Not familiar with the character, unfortunately...I definitely need to do more research! I'm familiar with Hansel and Gretel, but hadn't heard a version with Baba-Jaga specifically as the witch; she was always just "the witch." I suppose it's a regional variation.

I just found out that my library has an English translation of Propp's "The Morphology of Fairytales." I would definitely appreciate any English quotes you could dig up or translate, though; everything I can find online for him is in Russian, too.