Crone is more accurate translation of baba. And he's not supposed to be baba yaga at any rate. Movie also alludes heavily at little red riding hood, with her having to take cookies, not to grandma, but to sell, all while wearing red beret. All of this is to make him appear predatory and her even more innocent. There are also some elements of hansel and gretel in there.
Just like how he's not a crone, he's also not a wolf.

Actually baba means "old woman", yaga was her name.

Dev does describe Baba Yaga as being male though, it's possible she misunderstood or misheard the story but more likely that she just found a male witch more interesting
witches are almost always portrayed as female but not always

"I don't care, I'm still free. You can't take the sky from me"

The story she talks about throughout the movie is Baba Yaga, which is a Slavic folk tale about a witch. Baba Yaga is a female, I think you misunderstood the story. Many plot aspects of this film are based on the tale.