Frogs getting covered in coco fibre has been an inconvenience! I use some orchid bark on top of the coco to stop my frogs getting too messy. I have used small amounts of moss before too, but not at the moment. It's more of a bark layer though, not a mix.

It does have a tendency to dry out after a while due to lamps and heat mats, so misting the substrate directly helps the humidity and keeps the substrate fresh In my experience it only dries or spoils if left untouched for a few weeks.

Also, never had infections before