Not sure how to patch these rushed spots of coco fiber in my fire bellied toad paludarium

My paludarium is a couple months old now and I rushed the silicone and coco fiber process. Now a lot of foam spots are exposed. I know I should have used black foam for the whole thing but I wasn't able to find it anywhere. Any ideas on how to naturally cover these patches? I was thinking making some coco fiber vines and have them hold moss against the foam or something. Any advice is appreciated!