I always ran something like
This I like uh better then frost for whelp/blaze tanking.
Generally I drop a dnd on the portal just before the whelps come out, and I have diseases rolling on a blaze or something i have following me around so I can do an instant pestilence to all of them.
Of course I have UB ticking already, so then I just drag them over to shadron and dps shadron replacing BS, BS with Pest/BB on my rotation and they stick right on me and die to whirlwinds/pest/HS/cleave/etc