Geolord Mottle and Captain Flat Tusk share two similar spawn points, and it is possible to find them both up in one of the camps at the same time standing literally just a few yards apart.
Sergeant Curtis spawns in at least a couple of different locations in Tiragarde Keep. He can spawn in the upper level where you'll find the quest npc, Lieutenant Palliter. He can also spawn on the main floor standing in an empty room on top of a grate. Naturally, he is friendly to Alliance players.
Death Flayer is tamable by hunters, and although not a unique skin he'd certainly make a nice first rare pet for a low level hunter. He also moves very, very quickly.
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|Geolord Mottle, Captain Flat Tusk & Sergeant Curtis|
|Death Flayer & Felweaver Scornn|