yes, cats and dogs and humans and a lot of other species can have pinworms, but most of them are specific to host species, people can't get infected with frog pinworms and vise versa. no way to tell if crickets are carriers, you will see tiny white things in a frog poop that will be trying to get away, no need to worry unless you actually see them in a poop, because if so there must be a very big quantities in a frog intestines and that is when you want to get panacur really fastif you don't see them but you notice frog lethargic, loss of appetite, poop changes - then you want to do fecal to make sure they don;t have those nasty creatures.
nowould store-bought nightcrawlers carry parasites?