Green beans are unripe bean pods. When you eat green beans, you are eating beans, but they are still in the pod.
Yeh but fresh ones taste better.
Green beans are not Great Northern Beans. Great Northern beans are a white bean related to Kidney and Pinto Beans They can be. See my addition on the discussion page.
yes
Alton Brown's Green Bean Casserole
Parmesan-Roasted Green Beans
Tyler Florence's Green Bean Casserole Recipe
Green Bean Casserole