This is set in a slightly more medically advanced medieval era, which favors herbal remedies over blood-letting etc.
What I really want to know is:
1) Is it possible for the damage caused by being caught in a snare to permanently affect his voice (although not totally rendering him mute, possibly causing him to lose his voice completely when he reaches an old age)?
2) If so, roughly what would his voice sound like, and would it worsen or otherwise be affected when his voice breaks as he goes through puberty?
3) Any ideas on how the wounds would be treated?
I have looked up things such as "vocal damage" "voice damage" "voice injuries" "caught in a snare" to no avail. I have also asked a friend of mine who is working towards being a doctor, who said that it could be plausible, although she honestly isn't sure about what damage the situation could do to the voice.