After you tamed the wolbauk you need to send them to the orc village and before see Orgram go and see the other orc, the one with wolbauk mount then open the mount menu leave your current companion/mount and pickup the wolbauk, the you can see Orgram, if you send the wolbauk to your hunt then you need to do the same but in the mount menu of your house and then go back to the orc village with the wolbauk as your mount.