This is continous discussion.
Rodents on a kcal basis are nutritionally similar to insects however they are heavier and it is possible to feed them too often resulting in obesity and other problems.
As an additional concern commercial rodent diets are high in vitamin A which results in the rodents being high in vitamin A. This can disrupt the calcium metabolism of the frog resulting in a type of MBD.
So you would need to supplement the rodent with D3 to offset any risk of MBD and feed much less often with rodents. My old adults I offered an adult mouse once a week to once every two weeks. They often did not feed for several weeks in a row without any noticiable weight loss (anytime an animal loses 10% of total weight it is a cause for concern).
It is easier to feed the juveniles rosey reds as they will grow as quickly as if fed rodents without the other risks (as long as you do not feed frozen thawed).
I prefer not to feed crickets to Ceratophrys as at work we have lost a couple of animals due to puncturing of the intestional lining due to ovipositors (identified on necropsy). However you can also feed earthworms if you supplement the worm with calcium.
Ed