Hi Zheng, We cannot call anyone "feisty" a "punk." The dictionary defines "punk" as "a young ruffian; hoodlum." It's not the same as feisty, since feisty can indicate that the person is full of energy and not necessarily in a bad way. For example: "They have a very feisty child who brings a lot of energy to his basketball team." This child is not a punk just because he has a lot of energy. He would only be a punk if he picked on another person. I hope my answer helped. Please let me know if it didn't.

No. Different meanings.