No, all fry need live foods at birth. You don't start training them to frozen/prepared food until they are quite a few weeks old. Both Reidi and Kuda require rotifers, which you'll have to culture using 5 or 10 gallon tanks. Erectus fry can be started with newly hatched brine shrimp, which you'll have to hatch daily.
As stated above, Reidi & Kuda fry float around in the water and do not hitch for weeks. That combined with the fact they need rotifers cultured for food makes them quite challenging to raise. Erectus fry, on the other hand, can usually hitch right after birth and are easier to feed since they can eat newly hatched brine shrimp.
That is why it's suggested if breeding is a concern for you..Erectus would be the best seahorses to start with. If you're not interested in breeding, then Erectus/Reidi/Kuda are equally good as starter horses and are all available as captive bred from a few different breeders/vendors.
Tom