Not in my frogs, but yes in fish. Even many "smart" humans will rather eat dessert than veggies... just give the option to kids. Other than the occasional treat; should never offer a frog "candy" in large quantities or before staple meal is eaten.

I've "re-programed" fish by withholding food for a couple days and then offering just a few pellets. If they refuse them, take them out and do the same thing next day. By 4-5 five days they are all back with the program and then get 1-2 krill or prawn pieces after they eat their pellet meal.

You could try same procedure to get your frogs to accept a more nutritious (and inexpensive) food in diet (night crawlers and dubias). Be aware that some frogs can be very stubborn !