You can only complete one training session every 18 hours and must complete all five to finish A Frozen Egg.
Make sure you hail the pet griffawn, and choose play fetch to get this quest.
Your griffawn can wind up in some very random locations, using tracking to help find it may be a good idea.
Only the person with the quest can see or track the griffawn.
Toss bone that appears in your bags. You can be anywhere in the zone to do this.
Baby griffawn hasn't quite grasped the concept of fetch, quest updates and says he didn't come back and to find him near the Oubliette of the Rime ( -133, -317, 472 ) /waypoint -132.71, -316.96, 472.01, but he could wind up pretty much anywhere in the highlighted zone. Reported locations include: