Well, lethargy sounds reasonable to me first off plus no appetite, and impaction could end up deadly if it turns into bowel obstruction. I know it would be about impossible to give frog a laxative or fiber powder, but, if frog can take water it may help. I am not sure what the answer is for impaction....maybe increase in exercise plus water. I worry about mine after seeing them gulp down a cricket!Lethargy you will notice if frog does not care to move like before. Frog will be disinterested in old activities.

I would also think same thing applies to other digestive problems, too. I have a skinny frog that was shipped being thin and I have offered him extra worms. He's doing alright. When I brought him home and turned him loose in frog tank, he sat there just dazed! Other frog went right into the water but the skinny one sat on driftwood for a long time staring at his new environment. I don't think he was ever in a natural one before and after being in my tank, finally started acting like other frogs. I made my set up as natural as possible and they look very content.

I still don't understand how they eat then digest a cricket! Crickets look so hard! I don't think frogs have any teeth. If they do, I can't see them! They tend to swallow food without chewing, too. Hope this helps.