Hi mommyof4froglovers (long user name XD). Your White's Tree Frog (proper name for the Dumpy Tree Frog, though they're also nicknamed "The Smiling Frog" because of their big wide mouths) will appreciate a good sized water bowl to soak in. I recommend getting one that's kind of deep because when the frog grows up, it'll need the extra space, even if it's a baby now. Just make sure you provide clean bottled or de-chlorinated water every day (I change mine in the morning when all my frogs are sleeping) and keep it at the right temperature and humidity requirements. I also recommend a misting bottle full of distilled water for misting to keep humidity up and lots of branches or plants for the frog to hide or climb in. Tree frogs are arboreal, so your frog will really appreciate lots of space up high for him to climb around and check out his surroundings. Also remember that when purchasing frogs, it may take a while for the animal to adjust, so it's best not to hold or bother him for at least a month and let him settle in to his new home. Lots of handling is never recommended for any frog, but White's can occasionally be held as long as you have clean damp hands to do so, and you're careful, because your frog WILL jump, I promise you. Just give the little guy a few weeks to settle in and he should adjust well as long as you have all the requirements for his tank down. A good thing to make him feel safer may be to tape some paper to the outside of his vivarium to make him feel more secure, the more you're peeking at him, the less healthy he will be in the long run. Stress can have really negative effects on frogs and can lead to increased risk of infection, so it's really important not to bother him for the first few weeks you have him.
A picture of your frog, how old/big it is, and a picture of your tank would be great if you're looking for advice on how to keep this frog. If you want to know specifics, there is a GREAT care article over to the left about White's that has all the temp/humidity requirement and tips and tricks on how to make your frog happy and comfortable.
Also, I don't know anything about tadpoles unfortunately but here's just a quick tidbit. As a general rule, never keep two frogs of different species in the same vivarium. If you get a frog of a different species, please please please set up a separate home for him, no matter if it's a tree frog, firebelly toad, or dart frog. You never want to put two different kinds of frogs together, even if they live in the same climate because #1: each frog has different toxins in it's skin that could be harmful to other frogs. So if you have say an American Green Tree Frog in the same tank as your White's, either frog could be subject to what we call "slow poisoning" which does eventually lead to death. You may not see effects of this right away, but the long term problems can be harmful. #2: Frogs of different sizes tend to put each other on the menu. White's can get up to 5" long, if they're fully grown and female, and if you put another frog or animal in the vivarium that your White's can fit into it's mouth, I promise you, it will. Lots of people overlook this because not all frogs do it, but White's are known for their voracious eating habits will consume anything smaller than it that moves.
So, when your leopard frog morphs, I suggest looking up the requirements for keeping this animal and setting up a completely separate tank for it, if you can, but please do not try to house it with your White's, that's not a good idea. XD
Hope this has helped, if you have any questions, feel free to PM me or any other members you think may be able to answer your questions.
By the way, I have four White's and have been keeping frogs for only five months now, but you'll see as you go along, they're really great pets and companions. ^ ^