Moss is an impaction risk and can lead to blockage in the intestinal tract. Remove ASAP
You should be dusting with calcium plus vitamin d3 powder every other feeding and multivitamin powder once a week.
Do Bombina Orientalis even show up wild caught anymore? Anyway, you should have a fecal exam done on both frogs.
Recommend creating a quarantine enclosure to monitor the frog in question and to collect some poop for a fecal exam. The quarantine tank should include
-damp unprinted paper towels as substrate
-a water dish
-a place to hide
12x12x12 is tight quarters. A ten gallon long aquarium is more suitable for them.
As for the frogs abnormal size, I would say it's either eggs or the frog is fat. If the bloat gets bigger then you could try soaking the frog in lukewarm water to possibly break up any blockage in the digestive tract.
Good luck!





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