Hello Clarina! Need to follow Heather's advice now! Calcium supplements for reptiles will do fine; I recommend Repashy or SuperCal but unsure if available there. Do CA 2x a week and vitamins 1x a week on different days and with skip day in between.
Pedialyte is an oral electrolyte solution for infants and children that helps prevent dehydration by replenishing vital minerals lost during diarrhea and vomiting. As long as local product is similar and unflavored it should work. Process is to make solution mixing 1 part electrolyte to 10 parts 80F dechlorinated water and soak frog to chins depth for 15 minutes. If frog is dehydrated it will help.
Think main thing right now is to get CA into frog system per Heather's instructions. Also, can you get this product or similar in there: Repta Boost Insectivore/Carnivore? If Boris stops eating it would be good to have on hand.
Need to get de-chlorinator and treat frog's bath water with it. Days of leaving water aerating for couple days ended with the use of stable chloramines. Get a plain conditioner with out aloe. ExoTerra Aquatize is made fro frogs and is good, others made for reptile or Seachem's Prime is fine.
Unless you live in area where there is absolutely no spraying by government or neighbors; would stop collecting soil and replace with shredded coco product.
When you have time recommend visit forum's care article section and read ones for toads. Might find out more about their needs in there. Good luck!