take all your frozen foods, chop them up into tiny bite sized pieces, and see what they can eat. try prawns, muscle, whitbait, smelt, silversides etx.
Break up the carnivore into into even smaller pieces, throw that in, if they eat it great, if not, wait till they are abit bigger, then try again.
Main thing now is to put as much weight on as possible.
Bloodworm is the worst food for baby dats in terms on nutrition. But atleast there eating.