The second of the two mentions occurs within a list of Slavic gods and beings next to their presumed equivalence in Roman mythology (the Slavic god Perun, for example, appears equated with the Roman god Jupiter).
Baba Yaga, a hag from Slavic folklore -- Baba = old woman, rog = horn
Meher Baba | Sai Baba of Shirdi | Baba O'Riley | Ali Baba | Ali Baba Bunny | Sathya Sai Baba | Baba Keenaram Sthal | Ammo Baba | Neem Karoli Baba | Joi Baba Felunath | Giant Baba | Baba Yaga | Baba Sissoko | Baba Siddharth Gautam Ram | Baba Ramdev | Sant Gadge Baba Amravati University | Pir Baba | Baba House | Baba Brinkman | BABA B1A4 | Baba Amte | Tupeni Baba | Son of Ali Baba | Shirdi Ke Sai Baba | Sathya Sai Baba movement | Samadhi of Meher Baba | Koh-i-Baba | Jale Baba | Hazrat Bābā Farīduddīn Mas'ūd Ganjshakar | Hajji Baba |
Russia is being terrorized by an evil witch known as Baba Yaga (Andrea Martin), and the only one who is not afraid of her is Bartok the Magnificent (Hank Azaria).
In The Sandman: Fables and Reflections, Koschei's emerald heart (or, more likely a piece of green glass being passed off as such) passes into the possession of a Romani trader, then a werewolf, and finally Baba Yaga.
At that moment Vasilisa, appearing at the cottage's door, subdues Koschei with light from the skull she received from Baba Yaga in her legend.