First...what kind of toad? Toad is not a specific animal, rather it's a common name for a wide range of animals, sort of like saying 'I want a fish.'. Biologically, there isn't a difference between a frog and a toad, it's just different common names for amphibians (mostly, I'm guessing you don't want the reptile).
Once you pick a species, then you can research it's needs. Some are entirely tropical, others do indeed need a hibernation period. That can be accomplished by moving them to a cooler room/basement, or yes, a fridge that can be controlled well enough not to harm them by going too low.There are also a number of species that are fully aquatic.African clawed frogs are some of the easiest to keep. A 20-30 gallon tank with a good filter, smooth substrate, and a lid is all they need. They eat anything they can fit in their mouths, so can't be kept with anything smaller, but a pair will be fine together. They don't require a hibernation period, either, and are available at most pet shops in states where they are legal.
In terms of terrestrial animals, the closest in terms of ease of care might be the South American Horned,or pacman frogs. They get rather large, but aren't terribly active, so a 10 gallon tank will be fine for one. For more, check here:
http://reptilerapture.net/pacman-caresheet.html They have animals for sale as well, and provide good details on their care.
Keep in mind that frogs and toads can be VERY long lived animals.
