I think the answers to Frost weapon is yes. Notice below, after At-will it lists Cold as the keyword.
Power (At-Will • Cold): Free Action. All damage dealt by this weapon is cold damage. Another free action returns the damage to normal.
As for jester_gl, its not explicit but it would only make sense. However, at the end of the day, DM's call on that one although I'd be reluctant to say no since its cold damage.
Power (At-Will • Cold): Free Action. All damage dealt by this weapon is cold damage. Another free action returns the damage to normal.
As for jester_gl, its not explicit but it would only make sense. However, at the end of the day, DM's call on that one although I'd be reluctant to say no since its cold damage.