Can a teenager file against a fireman she says groped her cheeks while carrying her over his shoulders ?

Do you mean the cheeks on your face or your backside? If he touched you on the bottom in anyway that was inappropriate or offensive, speak to your parents and ask what you should do. Something may need to be said to his supervisor. Fireman generally are such great guys and risk their lives to save people...it would be sad to think a fireman could do this. Good luck.