Melt the butter in a large skillet over medium-high heat. Add the frozen corn and cook, stirring occasionally, until the corn starts to brown and develop caramelized spots, about 8 to 10 minutes.
Transfer the browned corn to a bowl. Add the mayonnaise, sour cream, lime juice, and Tajin. Stir until everything is evenly coated.
Top with crumbled cotija cheese, sliced jalapeño, and fresh cilantro. Serve warm.