Julie, as you are on your way of having a real frog harem at home , it would be worth it to invest in a Critter Totes, as mentioned already (All Living Things® Critter Totes - Fish Care - Fish - PetSmart). They are rather inexpensive. You will make good use of it, either when you get new frogs, or when you clean your tanks. You could put a thin layer of substrate, or even a wet cloth for the short trip.