I like corkbark for larger frogs that lay in a hut, and I prefer to use nothing for frogs that dont lay in huts, but I am looking into co co fiber for their tanks. Because I would rather not have to search through all the holes in corkbark for eggs, and if the male deposited them in a brom I wouldnt find them until they morphed.
I'll follow Ben on this one again. Coco panels are my favorite, just a little bit on the expensive side. For really large tanks (which I don't have right now ) I would probably use the foamed backgrounds (I do have this in some smaller tanks as well, ones that I didn't want to use my precious Coco panels for lol). I think the foamed background is best used in larger tanks where you can add branches and other built in planters.
Are you asking about the Cocos Panels? If so, yes. Mine have grown both ferns and moss. I have also seen tree fern panels and spagnum moss produce ferns, but I still think Coco panels are better. I have mounted spagnum moss on the Coco panels and it quiclkly starts to grow. I think they are easier to work with, and to top it off they are renewable.