Yer they be fine chop them up small at first and wait till he's took piece at a time get him used to them , eventually you'll be throwing them in whole , when I do that his mouths full for while gives chance for food to get to bottom for my cats
be careful with those bait prawns tho.... they REAK really bad after a while. On the odd occasion i fed prawns, i used the banana prawns (cut up obviously) you get from the supermarket.