I wont chastise your impulsive decision because i have done it myself. For the sake of the animal please consider taking it back before it is too late to return it. I would stick with the bettas and practice with those because 1 year is too short for a betta if kept in good condition. ive had mine for at least a year but I make sure the temperature and nitrogen fixation is good. I would wait until you have more knowledge and experience because frogs are very difficult to keep in captivity. If I were you maybe think of researching aquatic frogs since aquatic seems to be your thing. I would hold off thought because you are young and a long term commitment animal is something you dont need right now.