Rock- hard marble- sized lump on jaw line towards the neck and swollen mouth. Tongue feels like its being ripped open if moved. Any idea?

See dentist asap! My idea would be to see your dentist asap! find out what it is. Don't waste your time trying to have someone who can't see nor examine you try to guess as to what it is.

Sudden changes, As u are describing, usually are related to a tooth /dental infection that has extended well past the limited area adjacent to the tooth. With such drastic tongue symptoms and extensive jaw swelling you should quickly get to your dentist or an oral surgeon for an exam. Do not delay!