do you mean grasshoppers? locusts are those scary swarms of grasshopper morphs u see in the bible.lol.
how are u obtaining these grasshoppers? field plankton? clean field?
but as long as their gutloaded dusted, and clean of chemicals, i dont see anything wrong with them.
but WC insects have a greater risk of transmitting parasites and other unpleasantries, so good luck.