Frostbrood Whelpling



Frostbrood Whelpling is an undead whelp companion. It matches the Frost version of the Deathlord's Vilebrood Vanquisher.

Source
This item can be purchased for from Slimy in Acherus: The Ebon Hold above the Broken Isles. In order to buy it, you must have completed The Lost Glacier (quest).

Pet Journal
''Among the Death Knight's forces, the frost wyrm is the most formidable. This whelpling is no different.''