Why just not have her shake the crickets from the tube directly into the frogs enclosure and do the feeding free range? No need to handle the frog then. Or shake them out into a glass bowl inside the enclosure if you don't want crickets roaming the enclosure, see http://www.frogforum.net/vivarium-te...owl-trick.html
What kind of frogs do you have and is your wife willing to tweezer slow moving bugs like earthworms?