By now they may be drowned having added the humidity / spraying.
They likely came in the soil or tagged along on the crickets.

Keep the glass sprayed down.
Unless the infestation is so bad, and you see the mites walking all over the frogs ..... the frogs will be fine.

You can - CAREFULLY - wipe down the outside of the enclosure and everything around it with rubbing alcohol.
Check your cricket bin as that could be the source as well.
If they are in the cricket bin.....consider dumping the bin / wash it out and start new.

If you culture fruit flies.... check them as well as the possible source.