It does appear this quest is Draenei only, requiring Gift of the Naaru to activate. I foung a Youngling just east of the pond at 58, 42 on my 62 Gnome Mage and here are the various things I tried:
1) Agged a nearby yellow mob (Root Trapper) with level 1 frost bolt and pulled it over to him. He would not fight the mob.
2) Agged a nearby red mob (Timberstrider Fledgling) with level 1 forst bolt and pulled it over to him. He fought the mob and eventually agg transfered to him. I healed him with a bandage, which immediately transferred agg back to me, then patiently waited for him to finally kill it. When the mob was dead, he did not have a quest for me.
3) Killed yellow mobs in the area where he wandered until finally a red mob spawned (Timberstrider Fledgling, again), which he agged on his own when he wandered near it. I watched them fight their tediously slow fight until the mob was under 10% health and he was at around 35%, then hit him with a bandage. This ticked him up to about 65% health before the mob interrupted the bandaging, and I let him finish killing the mob. Still no quest.
Lame.