First, welcome to the forum!
Second, it is NOT a good idea to mix different species of frogs and toads together. Not only do the three species you have together require different habitats, but all frogs and toads have various levels of toxins on their skins that can be potentially fatal to those not of the same species. I would have to recommend that you separate them sooner rather than later. As well, smaller frogs/toads make a delicious snack for anything that can fit into a large mouth....it could end badly all the way around.
There are some excellent care articles available on the Forum to teach you about each of the frogs that you have. We also have a special section to discuss setups and habitats and there are members of the Forum that can share their amazing talents of tank setups to help you construct proper homes for your amphibian friends. But please, separate them first!!