I don't think Grif was being rude; he was just alarmed at the idea of leaving the frog alone for two weeks and "seeing what happens," because the frog will almost certainly die. I understand that you don't have money to pay anyone, but maybe you could call the pet store and explain the situation? They might be willing to let him stay there, with you providing the supplies for him, if you explain that your alternative is to leave him alone for two weeks. They may say no, but you won't know until you ask.