Any local vet will be able to get a fecal done, herp vet or not. You could also send it to Dr. Frye and he will do it. As far as the poop, it doesn't matter which frog they came from. If one frog has parasites, then so will the other. The skinny one just might have a higher parasite load. As for Electrolize, I posted a thread on it here and got some opinions:
http://www.dendroboard.com/phpBB2/viewtopic.php?t=344&highlight=electrolize
http://www.dendroboard.com/phpBB2/viewtopic.php?t=344&highlight=electrolize
