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Caught one up by Vermillion Redoubt flight point when in a battle with a turkey.
Found it in The Green Belt, which is the area north-west to Greenwarden's Grove. Supossedly only spawns at night, was 1947 server time when I found one.
Found up on the mountain behin Gruuls. Same place as the fire imps.
Here is a link to the map where I found mine, http://www.wowhead.com/npc=62555/flayer-youngling
The zone it says you are in to find them is Terokkar Forest.