Although a 10 gallon will be fine for juveniles, once they're adults I'd put them in something bigger, at least 15 gallons but 20 would be better. To save your time on misting, use a substrate of coir and then top it with sphagnum moss, press it down so not to impact them. Don't use green moss, though, it doesn't hold humidity as well as sphagnum and because it doesn't pack down well it can cause impaction. With impaction, a side may appear to be larger than the other and the frogs will go weeks without pooing and may spend a lot of their time in the water dish to try help go.

As a rule for most frogs juvenile frogs should be fed 1-2 days. Supplemented crickets, earthworms and dubias are the most nutritious foods for frogs, they can be easily gut loaded but still supplements should be used. You can use supplemented superworms for variety but not too often, they're not really that good and they're pretty fatty, good for large frogs, though. I'm pretty sure the whole biting through stomach thing is a myth and the stomach acids will kill them. On how much to feed, just feed as much as they'll eat and remove excess afterwards.