I am just going to chime in and state my experiences with frogs that soak all the time in their water bowls.
I had a blue poison dart frog that once ate a bunch of been weevils in one sitting. He/she then sat in his/her water bowl for the next 48 hours, then died. I figured it might of died from impaction and it was trying to loosen up it's bowel by soaking in the bowl. I know many reptiles will relax when soaking in water and then poop. I believe amphibians do as well. I am constantly having to clean water bowls out in my Microhylid cages, they are for ever soaking and pooping in the water.
Recently, my hatchet-faced treefrog starting eating, I bought it way back in April. I thought it would've died by now. Up untill recently it was always soaking. Now that it is eating it doesn't appear to soak as much. I really don't know what to make of this.