The vegetable you're referring to is likely the "pepper." Specifically, certain varieties of peppers, such as poblano or green peppers, can be green and have an olive-like shape. Another possibility is "pea pods," which can also be green and have a similar shape.
There's a really long list of places that start with the letter N. You can find them in this website: http://www.fallingrain.com/world/a/N/
Vegetables that start with Co include:CornCos Lettuce
Some words in french beginning with the lettet Q : Quota Quantité Qualité Quorum Quitter Question Quignon Quinoa
Lettuce, leeks and lentils are vegetables.
Escort, Enzo Ferrari, and Fords SUV family of Explorer, Expedition, Excursion, and the Escape. They also have the Edge. Eagle, Buick Enclave, Escalade, GMC Envoy, Pontiac Executive.
Marrow.
yam
Broccoli and Brussels sprouts are vegetables. They begin with the letters br.
Zucchini, these are treated as vegetables but botanically they are fruits
yellow squash
Turnip Greens.
Artichoke !