Juvenile frogs need to be fed more then that.
It's important if you wan't it to grow nice and strong to provide it as much as it like to eat.
It is no problem when some feeder insects are left over.
Just throw in a bunch and see how long it takes to be eaten, crickets that are grown to big can be taken away from the viv.
When i raised red eyes from tads they ate a lot more then 1 cricket a day at that size.