Wiggling Egg
Wiggling Egg is found at [64.4, 65.8] in a rylak nest in Grom'gar in southeastern Frostfire Ridge. Access the area by either running atop the snow-covered (eastern) side of the colossal corpse and jumping over the spine onto the highest, snow-covered, tarp. The egg is underneath cover guarded by a Thunderlord Beastmaster.
Loot the wiggling egg to gather a 
[Mysterious Egg] and 10-20x 
[Garrison Resources]. Much like the [Mysterious Egg] of the Oracles in Sholazar Basin, this egg will hatch in 72 real-time hours (3 real-time days) into a [Cracked Egg] which contains the 
[Fruit Hunter] pet.
Tracking quest
To check whether the wiggling egg has been looted, copy and paste this command into the chat window:
/run print(C_QuestLog.IsQuestFlaggedCompleted(33505))
If a "true" appears in the chat window, the wiggling egg has been looted; "false" indicates the opposite.
Patch changes
Patch 6.0.2 (2014-10-14): Added.