I agree. The general rule is 5 gallons per frog, however you will have plenty of time to get a bigger one. They won't get to full size for about 5 months or so. Some people prefer to keep new froglets in even smaller containers for a month or so. They can find food easier and are easier to monitor. My leuc was very shy for the first few months, so don't be alarmed if you do put them in the 10 and they hide a lot. They will get bolder as they age.
Enjoy your new frogs
-Ben
Enjoy your new frogs
-Ben