Hello Rob and welcome to FF! Could you please answer the following questions and provide pics of both frog and enclosure, thank you!
1. Size of tank
5. Water - source and chemicals (dechlorinator, conditioners, medications) added.
6. Materials used for substrate
7. Enclosure set up i.e. plants- How were things prepared prior to being put into tank.
8. Main food source
10. Lighting
11. What is being used to maintain the temperature of the water
12. When is the last time he/she ate
13. Have you found poop lately
14. A pic would be helpful including frog and tank (any including cell phone pic is fine)
15. How old is the frog
18. Frog food- how often and if it is diverse, what other feeders are used as treats
20. Is the enclosure kept in a high or low traffic area
21. Describe enclosure maintenance (water changes, cleaning, etc)
MarOxy by Mardel is an anti-fungal fish medication with some effect against bacteria. Although I'm not aware of successful anti-bloating treatments with MarOxy; maybe you can share link with info so we are all clear about it.
Do you have an aquarium test kit available? If not, can you take a clean water sample to your local Pet Shop and request a complimentary analysis of Ammonia, Nitrites, and Nitrates. Please take sample before you do a water change; otherwise we are just testing your source water. After you have results then please share here.
The frog is suffering edema because it's Lymph Hearts are failing due to a possible bacterial attack. Treating against the bacteria without correcting the cause that compromised the frog's immunity and gave rise to bacteria bloom inside frog is just a temporary fix. The medicine chemical bath could actually make things worse in the presence of Ammonia and other toxic chemicals. Hope to hear from you soon and good luck!