It would be cool if I could call the mail frog service from anyplace in the world and send an item right away to a friend. Instead of having to travel to a mail post every time I need to send stuff to friends or write letters...
I think this could be a skill: Frog Wrangling, or something like Batrachian Summoning! Or maybe you have a magic lantern that you rub which produces a Yogic Frog...