There are enough small pieces mixed in with it or pieces that come apart. It can be great reptile bedding if it is pure cypress, but just not safe for frogs. Even if it feels soft to you, pieces may still scratch the frog's incredibly sensitive skin. I used it in a background once. I siliconed it to the background and then sanded it down. Then I covered it with silicone to keep all the edges covered and soft and make sure there were no possible loose pieces. There were definitely some pieces mixed in there that a whites could accidentally scoop up.

I do think you'd like a set up like I linked in the thread. That way you can still add springtails to breed in the one layer and work as a cleaner crew so you don't have to pull the set up apart and clean it too often. They won't trail coco fiber around and no impaction hazards that way either. It's nice and low maintenance as well as safe.

The other thing you could do is a drainage layer and a planted set up. Your humidity would stay up at good levels, you almost never have to clean it, and your frog would probably love it.