Grilled Veggie Enchiladas

Name: Grilled Veggie Enchiladas
Ingredients: 1 whole Zucchini, Quartered Lengthwise; 2 whole Yellow Squash, Quartered Lengthwise; 1 whole Red Onion, Sliced Thick; 8 whole Mushrooms, Halved; Salt And Pepper; Olive Oil - For Grilling; 3 c. Enchilada Sauce (homemade Or Canned); 12 whole Corn Tortillas; Vegetable Oil, For Frying; 3 c. Grated Monterey Jack Cheese, More If Needed; 2 whole Green Onions, Sliced; 4 whole Roma Tomatoes, Diced, For Serving; Chopped Cilantro, For Serving; Crumbled Queso Fresco Or Cotija Cheese, For Serving