String Beans are definitely not pole beans. They are related to bush beans, which are edible. Bush beans are also known as runner beans, as they grow fast and look like runners.
The main difference between string beans and pole beans is the shape. Pole beans have a straight, vertical stem and string beans have a curved one. This makes them more difficult to harvest as they grow from the ground, but they also grow faster and produce more beans. String beans are best for long-term storage.