Yep. You can get the calcium in the reptile/amphibian section of the pet store. I am not at home but can take a photo of the brand I have when I get home.

The metronidazole is a 500mg in 100ml premix IV bag in which you draw it up and do only 2 or 3 drops per weight of the frog. It's not very expensive and much safer than trying to mix with sterile technique, and with sterile solutions. I would also be leery of using others. It is best to have a vet dose the medication and follow along with you. I do not know how the cat and dog preparations are made or at what concentrations. They sometimes add flavors to cat and dog meds to get them to take them. I do not know if they would be safe for amphibians.

Both metro and panacur are great medications and can be given even without a stool sample. Of course, it is best to know what you are treating, but in this case I'd get them started.

Dr.Frye helped me save 5 of my rescues .

The worms can sometimes be seen and some times are too small to visualize without a microscope.