I searched around on the internet and found him saying he just made all that up, none of those really exist =(I looked for mounts on WoWHead and found that:
Tiger - Spell - World of Warcraft <- Bengal Tiger
Old Crappy McWeakSauce - Spell - World of Warcraft
Summon Pink Tallstrider - Spell - World of Warcraft
Summon Brown Tallstrider - Spell - World of Warcraft
Summon Gray Tallstrider - Spell - World of Warcraft <- Tallstrider mounts
Summon Ivory Tallstrider - Spell - World of Warcraft
Summon Purple Tallstrider - Spell - World of Warcraft
Video Mount - Spell - World of Warcraft <- I dont think this is a playermount
Frost Wyrm - Spell - World of Warcraft <- Can be used in Azeroth?
Tawny Sabercat - Spell - World of Warcraft
Leopard - Spell - World of Warcraft
Golden Sabercat - Spell - World of Warcraft
Nether Drake - Spell - World of Warcraft <- 300% Landmount with Slow Fall O.ô
Obsidian Raptor - Spell - World of Warcraft
Riding Kodo - Spell - World of Warcraft <- I lol'd
Riding Clefthoof - Spell - World of Warcraft
Red and Blue Mechanostrider - Spell - World of Warcraft
Swift Dawnsaber - Spell - World of Warcraft
I think they are just test or NPC mounts.
World of Warcraft - English (NA) Forums -> Hidden ghost quests....
there are some hints about some ghost quests.