Frostmaul E'ko is required for the quest Frostmaul E'ko. You could turn in three of these for one [Juju Might].
This section concerns content exclusive to Cataclysm.
After the Cataclysm, the quest related to these items and the reward were removed, but these items were not removed, changed to poor, or allowed to be vendored. Sometimes Blizzard can be really lame.
Frostmaul E'ko dropped from Frostmaul giants in Winterspring.
This item is an objective of  Frostmaul E'koω τ ϖ.