I have 2 dragonets in my 29g tank and they both eat prepared foods.
If you can't get them to eat frozen then you need a reliable and ample supply of pods
for them to eat. It's not easy to get them trained to eat other food. It took me almost a month to get my scooter eating frozen and I bought an ORA mandarin that refused food that supposedly had been eating. It took a bit over a month to get the mandarin to eat frozen. They both like bloodworms the best followed by mysis.
These fish are really really awesome, but it takes alot of work to keep them happy and well fed. You also have to consider what else is in the tank with them, hungry clowns or more aggressive eaters will get all the food and leave the mandarin with none. They are very very slow eaters.
Hope that helped