mountain man; woodsman; alpinist
Refers to a man who lives in or is deeply familiar with the mountains, such as a woodsman, mountaineer, or a mythical giant-like figure. The exact nuance depends on context.
He is a mountain man and always goes climbing on weekends.
昔話に出てくる山男は、とても大きな体をしている。
The mountain man in the old tale has a very large body.