Because of the possibility of introducing pathogens, pests, chemicals (in the form of fertilizers, insecticides, and herbicides.) In addition, your local soil likely cannot sustain the plants that you want, while providing poor drainage and likely breaking down rapidly and molding.
Tree frogs really don't belong in anything less than a 20g. They are exceptionaly active after dark, so a 10g just won't provide nearly enough space to suite the animals' activity.
PLEASE do some research and really think carefully about your ability to really care for these animals.
Good luck.
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