I would not add any stock to that tank until it is fully evened out. The soil substrate can put off massive ammonia spikes I've read, so just do the 3 month QT for the frogs and wait for the tank to mature, safer for everyone. :)
Of course I'm no expert on planted tanks, so maybe ask also in the planted section how long it'll take that tank to mature and if it's safe to ad stock. I just know frogs are tough, but not tough enough to go with massive spikes.
OH AND ALSO GUYS!!! I POP INTO THE FORUM FIVE OR SIX TIME A DAY TO CHECK THIS THREAD IN PARTICULAR. IF YOU WANT TO ASK ME SOMETHING, DO IT, IT'LL BE ANSWERED WITHIN THE DAY. :3
If I do go tomorrow I think I might still pick up the frogs only because it's SO hard for me to get out to petsmart. I have the 5 gallon, a 3 gallon and a 2.5 gallon to keep them in for a while if I need.