If its the Senegal then it won't likely eat any greens, veggies or fruit. They are pretty much insectivores.
You can however, gutload your crickets with a wide variety of greens (dandelion, kale, endive, escarole, mustard greens, etc.) and veggies (carrots, sweet red peppers, squash, sweet potato, zucchini, etc.)...and it will get its veggies anyway!