Not fantasy, but there was a book about this weird entity eating a raven, followed by increasingly larger things like donkeys and children etc. It was all written in a poetic way.

I do remember the happy ending when the thing wanted to eat an old grandma whole along with her food, so she asks protagonist to wait until some food is ready, and then she stabs them in their sleep with a knife.

There is another, unrelated book by the same name that's more popular so searching online was pain. I could not find any pdfs, but here's the cover jpeg in low resolution and the author's name if anyone wants to continue from there.

Oburcuk by Selçuk Taykutgül.