Blend parsley, oil, and salt in blender until smooth. Pour into small bowl.
Cook bacon in heavy large pot over medium-high heat until crisp and brown. Using slotted spoon, transfer bacon to paper towels to drain. Pour off all but 3 tablespoons drippings from pot. Add leeks, garlic, and thyme to pot and sauté until leeks begin to soften, about 3 minutes. Add corn and sauté 2 minutes.
Add potatoes, clam juice, and cream; bring to boil. Reduce heat and simmer until potatoes are tender, about 10 minutes. Add scallops and bacon and simmer until scallops are just opaque in center, about 5 minutes. Season to taste with salt and pepper. Ladle chowder into bowls. Drizzle 1 teaspoon parsley oil atop chowder in each bowl and serve.