New Amazon milk frogs

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Just picked up my first ever frogs, Two juvenile Amazon milk frogs.
I have them in an 18x18x24 exo terra viv.
Now some questions:
1. If I add crickets to the viv will the little guys find them ok? I'm a little worried the crickets may be hard for them to find with the large viv size and leaf litter.
2. When I dust the crickets with supplements will most of it come off before the frogs get chance to eat them?
3. Should I get a cricket bowl for them whilst they are young/

Thanks for your time.