I.5 days without food isnt that long at all...
They look puffy after you feed them. I have a frog thats pooped once since this thread started. I keep feeding him, he has access to water and I soak him once a week. Eventually, the frog will poop.
They look puffy when they hold water too, which they do cause they are frogs. If they then become nervous and afriad (from say, handling...) then they will release all the water they are holding. They pee alot. Thats why substrate and water need to be changed frequantly regardless of how much they poop.

Keep feeding the frog and make sure its conditions are right and it has access to water. If you are taking it with you on trips out of town, chances are its a bit stressed out.