Sigh...

Visit some vegan bodybuilding forums. You'll see that it is possible for them to make gains, but they don't get huge. This might come as a shock, but you're not a gorrilla. If you eat nothing but fruits and vegetables you will not be gaining much muscle.

A good protein source is one which itself is high in protein. You should make each meal consist of a lean protein, a starchy carb and a fibrous vegetable. While some carb sources may contain some protein, its best to get your protein from lean meat.