I recently had to put my toads into a white bucket while I was building them a new habitat, much like in your pictures, and I noticed that they were all pretty fat. I'd say about halfway between the bottom green frog and the brown frog in your second picture. However, they all seem to have pretty good appetites and all poop regularly (too much for my liking :P). I wouldn't worry about it too much for the time being. Just watch them and see how they behave over the next week or so. Apparently you can put them in some warm water with a little bit of honey to help them poop if you think they are impacted. Sorry for not answering your question better!

Keep us posted.