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In term of a Feeding tank, I just use a cricket enclosure. You know the cricket breeding tanks? Like this… https://www.amazon.co.uk/Exo-Terra-Cricket-Pen-Large/dp/B0073KOGOG/ref=asc_df_B0073KOGOG/?tag=googshopuk-21&linkCode=df0&hvadid=256266130274&hvpos=&hvnetw=g&hvrand=9359006619378716509&hvpone=&hvptwo=&hvqmt=&hvde.... Humidity is super important for your bullfrog, more so, I would say in his adult tank. When BruC was in his small tank… I could see the condensation in the container so was satisfied it is humid enough! So I personally, didn’t track his humidity levels when he was a baby because I could see it quite clearly without doing so! So if you can see the condensation, he should be ok for now
https://www.amazon.com/Exo-Terra-Cricket-Pen-Size/dp/B0073KOGOG/ref=br_lf_m_ww83k73y62454pn_ttl?_encoding=UTF8&s=pet-supplies is my favorite of the 2 I use. They only say for 100 but we have done a bit over 250 and almost none died they just crawl like 40-50 in each of 4 tubes and then rest at bottom. You wouldn't be able to keep 250 all the time but we buy them that many and after a day or 2 it's down to more manageable numbers
You can try something like this, but I would accept the fact that you will eventually have escapees. An alternative that is easier to keep contained are dubia roaches.
I haven't had a single cricket escape from the cricket cage I bought (at least I haven't found or heard any...).
My SO likes it because you don't have to touch any crickets or even open the cage to feed, when I am away.
as others have mentioned relocation stress is a thing. they sometimes don't eat for the first few days you have them. but getting them comfortable will speed up your time table a little bit.
I highly recommend you live feed them some feeder insects https://dubiaroaches.com/collections/bearded-dragons you can get the baby bearded dragon variety pack and it seems to be a pretty balanced diet for baby beardies. it has baby Dubai roaches and nutriworms or soldier fly larva whatever you want to call them.
Here are my recommended reads from the sidebar for new dragon tamers
i think pet smart calls dubia roaches spotted roaches if I remember right. they are expensive there though thats why I linked the site. the problem with shipping roaches is they might die when it is to cold out so you have to get them inside asap I use a cricket container to hold them since they can't fly they tend to climb into the tubes it makes it easier to feed them. I like to have 2 containers so that between shipments i can clean out the containers without having to deal with them.
Hope this helps :D