I would like to explain something important regardless of whether dissecting a frog that is now dead is good or bad. There is a scientific reality that might be useful to know for American school students who keep these laboratory animals in schools. It's not your case, but it's on topic and it's always good to know.
Releasing laboratory-used frogs (or other animals) into the natural environment can pose significant risks to local ecosystems. These amphibians, once in captivity, may be exposed to diseases or parasites not present in wild populations. By releasing them, there is the possibility of introducing pathogens that could threaten native species. Furthermore, laboratory-bred frogs may lack the skills needed to survive in their natural habitat, negatively affecting both their survival and ecological balance. For these reasons, it is generally not recommended to reintroduce frogs or other animals into the wild that have been in captivity for extended periods.