Crok Scourgebane yells: Ready your arms, my Argent Brothers. The Vrykul will protect the Frost Queen with their lives.
Captain Arnath yells: Even dying here beats spending another day collecting reagents for that madman, Finklestein.
Crok Scourgebane yells: Enough idle banter! Our champions have arrived - support them as we push our way through the hall!
Sister Svalna yells: You may have once fought beside me, Crok, but now you are nothing more than a traitor. Come, your second death approaches!
He shares his surname with Seril Scourgebane, but it's pretty safe to assume the two aren't related (since Seril is a human whereas Crok is an orc). It's also possible that Crok wasn't known as 'Scourgebane' during his life and adopted this surname as a Death Knight, after he joined the Knights of the Ebon Blade.
Patches and hotfixes
0300Patch 3.3.0 (08-Dec-2009): Added in Icecrown Citadel
0300Patch 3.2.0 (04-Aug-2009): Added at the Argent Tournament Grounds