Per the Official Site:
He's also kind of a versatile Special Teamer as he can kickoff (though not very well) if/when Shaun Suisham sustains injury. I like having an open Kickoffs competition without having to actually put an extra player on the roster. He holds on Field Goals as well.
Derrick Frost does not represent a big Cap Hit, either. At 850K he is a fairly cheap solution at the Punter position; I'll take it. Welcome back, Derrick.