It may take some time for your toads to get used to crickets, mine too did not take to them at first, for now introduce them slowly, 2-5 crickets let roam free in their terrarium, though you may not actually see it, this may/will envoke a feeding response when you are not present. 20 crickets is far to many to be roaming around in their terrarium, this will stress them, remove at least 15 of the 20 crickets, and leave 2-5 crickets to roam around and catch the toads attention.
If after a while you still do not have luck with crickets, try removing their back legs, these may be bothering your toads, just a suggestion though, it may or may not work.
Another excellent food source are worms/nightcrawlers, these again, may or may not catch your toads attention, they make, large, slow movements, so it all depends on the toad, for instance, I have one toad that absolutely loves worms, whereas with my other toad, they do not even attract his attention.
Crickets by far are the most convenient feeder insect, they are fairly easy to keep, basic care needs, and you can release them into the frogs/toads enclosure and let the amphibian hunt them, whereas most other feeders such as worms/nightcrawlers, mealworms, etc will burrow into the substrate, so you have to be there to ensure a successful feeding.
If you can get your toads eating worms/nightcrawlers all the power too you! They will eventually come around on crickets, don't worry!
Also, you must purchase a 2:0 Calcium & Vitamin powder to dust their food with every second feeding. This will ensure they get a proper "source of nutrients".
~Royce
P.S. How long are your toads, STV (Snout to Vent) length?