Gabby,

Try to answer the questions (in post #7) as best as possible

Sorry for the troubles you are having and very sorry you lost a frog

I would separate each remaining frog.
A frog this size should not be eating fruit flies. FF should NOT be a regular feeder.
The ff are much too small ! Continue to feed the the dusted worms and small crickets.
**The worms ---if they take them --- is a feeder that is easily digested for a sick frog.
You are better off feeding them a few dusted crickets daily vs a lot of crickets all at once.
The frog in photo # 3 is very thin

Housing for frogs should be 1 frog per 10 gallons. "Cramped" could be causing the "skinny" !
The small quarters are likely causing tremendous stress -----> setting yourself up for a spiral downward ... of issues. It's imperative they have a larger tank -- ie 40 gallons if they are to remain together ( or 2 -- 20 gallon )

Get rid of the sphagnum moss--- as they can swallow it by accident.
( Use dampened paper towel for now ---dampened with properly prepared water - NOT distilled)
Change it every day. Wash your hands ( or use disposable gloves) between each little hospital enclosure.

As mentioned, if any of the frogs have diarrhea you will need to find a vet to do a fecal ( poop ) test to rule out the possibility of parasites. You might as well do only one test....since they have been housed together ---and if found to be positive---they will ALL have to be treated prior to be housed together in a MUCH larger enclosure.

You need a solution for the food as it's imperative that availability never be interrupted.
Do everything possible to become very proficient at and keep a few cricket and worm cultures!
Or ....at the very least secure shipments of both from a supplier via the mail ? This sounds like a tough one for you , sorry.

The extra shedding. A frog should be rinsed very well after a honey soak.
Hydration will occur if you use properly prepared water for the frog's soaking dish and simply get him to stay in it with a loose fitting lid with air holes.

If the 'extra' shedding occurred 1st--- has the frog been exposed to any kind of chemicals--- of any kind.
What do you use to clean the tank? Let us know

Please keep us posted