I routinely use small portions of frozen corn, peas and green onions in dishes like fried rice, soups, and casseroles. Bento weblog Lunch in a box recommends using a water bottle to store frozen small vegetables to avoid freezer burn and make it easy to dispense the amount you need.
You can pour bagged frozen vegetables into a water bottle using a funnel. If you have fresh veggies, you should spread them out on a baking sheet and flash freeze them before storing in the bottle.
Speed tip: Frozen corn in plastic drink bottles [Lunch in a Box]