Make the Dressing: In a large mixing bowl, whisk together mayonnaise, Mexican crema, lime juice, and elote seasoning until smooth and creamy. Taste and adjust seasoning as needed.
Mix the Slaw: Add thawed fire-roasted corn, coleslaw mix, chopped cilantro, diced jalapeño, crumbled queso fresco, and green onions (if using) to the bowl. Gently toss everything until well coated in the dressing.
Chill: Cover and refrigerate the coleslaw for at least 1 hour to allow the flavors to blend.
Serve: Before serving, stir the coleslaw again and taste—add a pinch of salt if needed. Garnish with extra queso fresco, a sprinkle of elote seasoning, chopped cilantro, and tri-color tortilla strips for crunch and color.