I found some things give snow sword, I don't know the effects or anything on the skills, but I've got some of the names through treasures and Sword upgrades, so here's a few. Hope that Snow Sword comes out soon, sounds really interesting. I pawned most treasures with them, so unfortunately I can't remember all the skills, but I'm going to try to keep an eye out for them, and who knows, maybe some of the predictions will be correct.
Sharp Frost and Shadow Snow - I personally assume this to be either the Rage or Feint skill.
Broke Ice into Snow - If the previous isn't the Feint, this is my next guess.