In my experience, when it comes to mounts, there is always a tribe quest that has you utilizing the one they give you in some way. For example, the Ananta had both the marid and griffin mounts, with the former involving a quest to stomp ants and the latter to flap its wings to chase away bugs. Having had a ride on the pig mount today, it's a safe bet that that is the later reward if someone hasn't mined the list already.