Cook 6 slices of bacon in a skillet over medium heat until crispy, 5-7 minutes. Drain on paper towels, then crumble.
If using fresh sweet corn, grill or steam 2 cobs (or about 2 cups) and remove kernels. If using frozen sweet corn, thaw and drain thoroughly.
In a large bowl, mix ½ cup sour cream, ½ cup mayonnaise, and 1 packet (1 oz) ranch seasoning mix until smooth.
Fold in 2 cups sweet corn, 1 cup finely grated cheddar cheese, crumbled bacon, 3 tbsp finely diced pickled jalapeños, and 3 chopped green onions. Mix until evenly combined.
Cover and chill for at least 5-10 minutes, or serve immediately.
Garnish with additional green onions or bacon crumbles, and serve cold with tortilla chips, crackers, or veggies.