Can pharyngitis cause enlarged jaw lymph nodes? For longer period. Or can tonsillar stone can cause enlarged jaw lymph node?

Yes, to both. Certainly, pharyngitis can cause enlargement of lower jaw lymph nodes. Lymph nodes can become enlarged and tender in response to any regional or local infection. Keep taking your antibiotics and find out the results of your throat culture! See your doctor if you don't steadily improve. Get well soon!
Yes. Both entities can cause enlarged lymph nodes. There are also other reasons. You are taking antibiotics and have had a throat culture. If your enlarged nodes persist, you must be evaluated by an ENT doc.