PC Cheats - Warcraft III: The Frozen Throne Guide - IGN
Warcraft 3 - The Frozen Throne (PC) Cheat Codes, Hints, and Help PDF | PDF | Races And Factions Of Warcraft | Leisure
Using the full map cheat code (iseedeadpeople) on the first level in the 2nd scourage campaign, you can actually find the Lich King asset used in a cutscene : r/warcraft3