Some of them are rookies in the sense that they would qualify for Calder voting. Most of them are in their early-mid twenties and have played NHL games, have marinated in the AHL and NCAA, and are waiting for a chance. We are not talking 18 year olds fresh off their draft year - Calgary knows what they have with regards to their development curve.
I like all of those guys and think they are NHL caliber now with plenty of room to grow but they don't have any leverage at all from a contract standpoint.
They will all sign for cheap.
As someone else said, things get a bit more dicey when we have to sign Ferland and Tkachuk. Frolik, Brouwer, and Stone will have to go at that point. But next year we're fine.