Sorry, Kurt, but I have to disagree on this, speaking from personal experience. My female African clawed frog did choke on aquarium gravel during feeding. She was so excited and just started shoveling it in with her front legs. I had to fish her out and remove the gravel from her throat with blunted tweezers. She survived, but the gravel was tossed. I would be very leery of using such gravel with these guys, but I have had no problems with it and Dwarf frogs.