I can not imagine that this experiment will help to grow people's feet. Assume the possibility of this action is also not possible, because the time of development of the frog's organism is much less than that of a person.
It might, think of it like experimenting on rats; they may be very different than people, but it allows scientists to begin experimentation until it is somewhat safe before they try on people (or more person like animals like monkeys or pigs).