culturing your frogs food is the best option. that way you know what is getting passed to your frogs unlike store bought insects which have been know to carry parasites at times.
Isopods may be a good route to go as well. You should have great success.It does not take much time out of your day. I have a very large colony of roaches and even the size i have it takes me 5 minutes a day to care for them. they do all the rest. you can even check up on them once every couple of days to a week or two. I leave town all the time for weeks at a time. My girlfriend takes care of the frogs but wont go near the roaches but there is no need for her to do so if i supply enough dry food. other Insects may differ in care but from what i have read Isopods are even easier to culture then roaches and trust me roaches are very very easy. I don't believe you will have any difficulty.