Frostmaul E'ko is required for the quest  Frostmaul E'ko. You can turn in three of these for one [Juju Might].
Frostmaul E'ko drops from Frostmaul giants in Winterspring.
You must have [Cache of Mau'ari] in your inventory to loot Frostmaul E'ko.
While Frostmaul E'ko is not flagged as a quest item, [Juju Might] is.
As a quest objective
This item is an objective of  Frostmaul E'ko.