I find way too many ironic inconsistencies with your argument. You state that you have read information on how mice are bad, but you do not offer any supporting literature for your stance on feeding mice at all. Your once or twice a month timeframe is completely subjective, what exactly is this based on other than your own intuition? Is your intuition able to give you x-ray vision to see when your frogs bones are getting weak and fracturing on the long bones?
"i am just tired of reading that mice are bad and etc etc etc." this statement tells me you are just being hard headed and not adequately researching the subject. Apparently you're not willing to give up using mice, probably because of convenience. There are many invertebrate food items available, and hissing cockroaches are ideal, how can you justify using mice that are known to be so detrimental?
Although it is entirely possible to use mice with adequate supplementation and diet variation, the average frog keeper is not capable of doing detailed nutritional analysis to do this properly. Making your claim on a public forum like this with beginners that are not able to weigh the options completely is reckless. I strongly urge you to check out the Amphibian Medicine and Captive Husbandry book by Dr. Kevin Wright for convincing evidence not to use mice, ever.
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...the oldest task in human history: to live on a piece of land without spoiling it."
Aldo Leopold (1938)
"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
Calvin and Hobbes