Heat a skillet over medium-high heat. Add the corn (no need to thaw) and cook until lightly charred in spots, about 5–7 minutes. Cook in batches if needed to avoid overcrowding and ensure the corn chars rather than steams.
Let the corn cool slightly.
In a bowl, mix mayo, sour cream, lime juice, garlic, chili powder, smoked paprika, and salt.
Fold in the corn, cotija cheese, and cilantro.
Taste and adjust salt or lime as needed. Serve immediately or chilled with tortilla chips.