Strange, thought answered this post yesterday. In general it's not a good idea feeding SW organisms to those that have no natural contact with ocean. Could feed fresh water origin prawns and crayfish as treats; but had to kill and peel first. Crustacean exoskeleton is way harder than adult dubias and even those can cause constipation. Some crustaceans even have sharp pincers and "horns" that could damage the frogs digestive system .