I'm very sorry about the dead one, but great job for having the courage to save this little guy! I would actually, just for now, keep him on dampened paper towels, just to reduce the risk of him swallowing coco fiber. A quarantine setup is usually recommended whenever getting a new frog, particularly since this guy is so skinny. Other than the paper towels, this is a perfect QT. Fake plant, water dish, and dampened paper towels are what you always want. I would also get a pyrex dish to bowl-train him, so that you can keep track of his/her eating, and prevent it from being bitten by crickets. Once again, nice job on the save, and I'm glad he/she is in better care now