I have nightcrawlers but my frog doesn't even care for them, It's weird because most owners say their frogs can't resist nightcrawlers :/
I think I solved his not burrowing mystery, the coco soil was sopping wet! I don't know how it got like that since it was rather dry the day I made the eco earth and I don't pour a lot of water in there. But I squeezed out a LOT of water and now its much better Hopefully he burrows in soon, my next thing to add is a half log hide.