Unknown children's song

Unknown children's song
https://www.youtube.com/watch?v=_8cqHF05DKs

from movie "Samurai II, Duel at Ichijoji Temple" (1955)
https://www.imdb.com/title/tt0048579/

Lyrics starts:
"Oh yuki, ko yuki, o neng san wa ni e no, nani si te o na ...
(hard to write down the lyrics)

"The snow is falling deep
Monk Horen's hut is out of sight
What is he doing asleep?
He's reading sutras all night
Eating snow to keep his might"

Do you know song's name? Thanks.