I feel kind of silly asking such a question, but I need to know. Just where, exactly, are my little frogs 'deposits'?

I see nothing scattered around the enclosure at all, though it is planted and I suppose it could be hidden among plants and substrate...or, is it part of the 'sludge' that I dump out of his water dish? There is always a layer of coco fiber, etc, on the bottom of the water dish every time I clean it. I guess I just figured that I would have some scooping to do, lol!