Typically, you can take a fecal sample to the vet and they can check it for you. I am on beardeddragon.org cause I have beardies too, and there is a website that you can order fecal kits and meds to treat parasites. they a;so have a link to a page to help you identify common parasites. Heres the links.

http://www.rioreptiles.com/tutorials...tification.pdf (parasite identification page)
Medications (site to order meds from) The lady that runs the site is very helpful. she might be able to answer questions about frogs and parasites.