Why would you want to hide it? They are not illegal to own. Only to export and transport across state lines. They go to ground and come out at night to feed. In the summer months we keep them outside in a 25 by 25 foot covered pen that is 4 foot high. We have lots of 4 inch pvc pipes buried in the dirt and inside of those we have some flexible drainage tubes so we can retrieve them when we need to. They cannot jump the 4 foot walls, but they can and do scale the walls of their enclosure which is why we cover it with screen. During the winter they are stored inside, but in the garage so it is pretty cold and it forces them into hibernation which is good. They need quite a lot of room to be happy and stay healthy. They would probably not do too well in a stealth situation unless they had access to real sunlight, reliable water, dirt that was deep enough to escape the heat of the day, etc. They are also nocturnal so they need to be able to go underground to escape daylight.
They can also get really big. A Bufo Alvarius that we mailed out started out the size of your fist, was seized by customs and they took care of it for about 2 yrs while we dealt with the legal fallout. When we got her back, she was the size of a baseball cap. We donated this toad to Krystle Cole for her Youtube video showing how to safely milk the toad.
Another thing worth mentioning about these toads is that they are voracious eaters. If you do not have access to a pet store that carries food, then you need to think bulk mail order. My toad, 7 of 9 eats about a thousand mealworms every 2 weeks if that is all I give her. But they will get bored with the same old offering. I buy 10,000 crickets, and 5000 mealworms at a time, and I breed my own mice for them too just to keep up the variety. Variety is essential to their diet if you do not intend for them to stop eating.