I'm still confused as to why you object to feeding mice/rodents. Not only are they the preferred diet of keepers, but rodents are their natural prey, in addition to the occasional bird. Also, if you try to do a strict amphibian or reptilian diet, you may have issues keeping a steady supply of them. You'll probably have to start a feeder colony yourself, which will in turn require their own specialized diet. Seems like a huge hassle IMO when you can just stock up on frozen rats