You could try but I really am not sure they would move around enough for th e gecko..I guess if the gecko doesn't eat it then you could just toss it right?
One of my females eats them. Another one can be "tricked" into eating them (put a wiggly mealie right over it lol), but none of my other geckos will touch them.
I have a male that will eat the beatles, though. Not the black ones, just the pale ones and occasionally the red ones. I feed them to him when my colony gets too big