Hello,
I could be wrong but it sounds like the toad is stressed from being found and placed into a bucket they usually puff up as a defense. since it is very stressed its possible it might remain bloated until it calms down. I am unsure if it is injured at all from the pitchfork but more pictures would help determine if its alright they do release urine when they are startled so the fluid it . Its entirely up to you if you wish to keep it as a pet, if it is too cold to release it then you may be able to keep it (check local regulations about wild pets) or if it seems alright and its before the frost begins in your area they you may also let it loose outside (preferably away from humans) and let Mother Nature take it's course. you can also set up a small plastic tub with a water dish, dirt fake plants and offer feeder insects and observe its behaviour to make sure it's alright. any more questions feel free to ask!