Just make sure its 100 percent silicone such as GE II silicone for windows and doors and not kitchen and bath.
Home Depot and Lowes carry GE II in multiple colors.

Put the silicone on thick and sprrad it with a rubber glove. Areas that your accidentally get silicone on scrape of with a razor blade after drying.
Pack in the dirt/substrate tightly to the silicone and pour it on. You can dump out and air out the excess when its all dry.

You can do touch up once dry with a little more silicone and another application of substrate.


For the new frogs, a large Tupperware with some ventilation and some wet paper towels is good. You can also throw in some fake leaves or a cutting of something like pothos or creeping fig to let them climb on and hide under. Fake vines will work too.