^The thread title is misleading. He meant "is there a way to control the ring of polymorph?"
Also the rival to every single piece of equipment, remotely helpful or otherwise is the Mystic Dark Frog, since there currently isn't an item to resist items being teleported off you. Although a ring of telecontrol can help if they try to randomly teleport you, it will only last until they steal it from you.
The worst thing that happened to my character was being teleported into a secret room sealed off from the rest of the level, and having all equipment that could help me escape (scroll of teleportation, wand of teleportation, rings of tele and telecontrol, pickaxe) taken off by the mystic frogs. It was a choice between starvation or suicide. Suicide won once the frogs refused to teleport me out again. Also I didn't know Sophos.