I've found that frogs and freshwater crabs like to escape a tank whenever possible, so unless your tank is completely covered you're likely to find them mummified on the floor.
* just playing the part of my devilish naturalist self here... (o:
What kind of frogs would someone keep as pets? These must be exotic species, no? Up here, a person would require a permit to keep our native species (frogs, snakes, turtles, etc..) and it's not that easy to get one - so most people who keep herps have exotics (Ball pythons, Fire salamanders, etc). I would think that, especially in southern states, there would be quite a bit of concern about exotic herps getting loose and becoming invasives -- I know this has happened in the case of Red-eared slider turtles (Trachemys scripta elegans) in many parts of the U.S. -- see link to USGS factsheet below. With the climate being as hostile as it is up here, we don't have quite so much of a problem as most exotic herps can't live through winter in the wild, although there are actually a couple of locations in southern Ontario where Red-eared sliders have been found living in the wild (bad, bad!!!).
nas.er.usgs.gov
-croc |