I have had babies eat greens at 5 days old. Try misting them a little(with water) in the wild they lick dew off the leaves and take a bite as well. Also what I have tried is mixing green with meal worms they end up eating them at the same time and then realize the like them. I did have a beardy once that NEVER ate them but most eat them with gusto. Some beardies aren't interested unless there is movement and greens dont move. Good luck