Mods only but mods are available for PC version only. And you can’t trade “vanilla” Thralls even via Pippi merchants and Thespians. IDK why, I’m not a modder but looks like Thrall objects from Wheel of Pain differ drastically from Pets objects from Stables and Animal Pens even before all of them are placed in the world. I’d be happy if we could “transfer ownership” of our placed Fighters or steal enemy horses in PVP but alas.