Find 15 frozen Tauntauns in Wampa Valley at Hoth Instance.
Once you click it, it will disappear and spawn at some other spot shortly after.
If more than one person in your group needs it, just stand near it, count down and click at the same time.
Works most of the Time.
Can also be found in other areas. found one near the Main Hanger Shuttle to leave the instance.
Reward: Mounted Tauntaun Head and a small amount of XP.