Heat the oil in a large nonstick skillet over medium-high heat. Add the yellow squash, zucchini, and tofu; sprinkle with 1/4 teaspoon salt. Stir-fry for 8 minutes or until lightly browned. Stir in 1/4 teaspoon salt, corn, and the next 8 ingredients (corn through jalapeno). Reduce heat, and simmer 8 minutes or until the corn is tender. Serve with rice. Sprinkle with cashews.