Sure. Are you planning on leaving a tank in the hedge to "marinate", swear multiple oaths upon it, or steal it from the True Fae? If option one or two, how will you get the tank in the first place? To make a hedge-forged token, it needs to be something with personal meaning to your character. Is it the tank your mother gave you just before she died? If it's an oath-forged token, you still need to get your hands on a tank somehow, then you have to convince changelings to swear an oath it... a tank... three times. Will they even be willing to swear upon something so large and conspicuous,...