Can amoxicillin help a infected tongue ring ?

Possibly...: Take the piercing object out now to allow for more predictable healing. See a dentist immediately. Never, ever pierce oral structures.

See a dentist asap: Amoxicillin is an antibiotic that is used to treat oral infections. You need to take out the piercing, clean the area and see a dentist who can treat the infection properly. There are many bacterial the mouth so you should not treat this yourself. See a dentist.

Tongue rings: Unfortunately you have experienced one of the possible complications of oral piercings. Others are broken teeth, lacerated tongues, & accidentally swallowing of foreign objects. Oral infections need to be treated by a professional who knows how to properly prescribe the right antibiotic, prevent even more serious complications & hasten recovery. See a dentist rather than rely on internet medicine.