Yes a broken pinky toe can and will heal on it's own.
Usually there's no need to get medical attention when you have a broken pinky toe and usually just resting the foot and toe at home can allow the broken pinky toe to heal on it's own.
However if you notice any swelling or other bruising then it would be best to go to urgent care or a walk in clinic or at least see your doctor about.
You just don't want the broken pinky toe to become infected.
But even if you don't go to the doctor or get medical attention for the broken pinky toe the broken pinky toe will heal on it's own.
Most broken pinky toes heal on their own fully within 4 weeks to 6 weeks but if not you should see a doctor.