Many years ago a friend caught a gravid female getula and gave me some hatchlings. Those babies could not have cared less about pinky mice. Out of desperation I caught some chorus frogs and threw them in the cage. The babies went nuts and ate every one. After a few chorus frogs they took mice fine and grew with no further issues.
I have been told by others never to feed frogs to snakes because of parasites, but I have never had a problem with it. Beautiful little king, by the way.