You're frog will find the crickets without any doubt.

I always wonder where it has come from lots of people advicing to pick the frog up to put it in a feeding container,
or that putting crickets in an enclosure can only be done inside a bowl.

The lights are already out now, but if you like, tomorrow i can take some pictures of my tanks, crickets and all.

I even use the smaller crickets for my poison dart frogs, sometimes i find one that managed to grow adult size, to big for them to eat.
Only catch them out because they eat my plants and destroy the backwall.
Never experienced any problems at all, nor did i experience any problems using loose substrate and different kinds of moss.
Whenever i see a frog taking some substrate with it's prey, i see them sticking their tounges out to scrape of most of the dirt,
the little bit that is left shouldn't pose lots of troubles.
I believe in nature they will ingest some material as well, the worst i experienced was a prolapse, but that heals itself quit nicely.
In my opinion, the hard exoskeleton of some insects will cause impaction more easily then some dirt

Getting you're frogs out, sterilizing you're tank, and so on, is only causing stress to the frogs.
A frog will thrive best when left alone as much as possible.
When i see the amount of threads about sick or dying frogs i wonder why it keeps continuing keeping frogs in sterile tanks getting them out to feed.
Stress is a strong factor in bad health, if not number one.

A frog not feeding will loose weight.
Stressed frogs will sometimes refuse eating as well,
see the path we're taking here?
(Help, my frog won't eat! Help, my tree frog dug himself under the substrate! Help, i think my frog is sick, My frog died what happened? etc.)

When you know you're frog, you'll see it soon enough.
I never keep track on how many bugs are eaten, counting the fruitflies i give.
I throw in an amount, when it's taking to long to get eaten, next time i feed less and/or put in new feeder insects when most of them are gone.
Far less troublesome for yourself, and less stress moments for you're frogs.
As long as you're frog looks healthy to you, he mostly just is.

Just have some faith in yourself, after all, you know you're frog best.
After all, you raised him/here from being a tad already