Is it safe with walking on hair line fractured talus bone. Minimal pain but swelling on ankle. Avn is not confirmed in CT scan.

Probably not. It is always better to take the pressure off particularly if there is swelling . It does not mean that you should not walk but use the boots you can buy from pharmacies or medical supply offices until you see your orthopedic doc. Do not forget to put ice pack on the swollen ankle , will help with the swelling and pain . You might as well take over the counter alive or advil (ibuprofen).
AVN. Is always the main concern of talus fractures so play it safe and be non weight bearing.