In a large bowl combine flour, cornmeal, sugar, baking powder, and 1 teaspoon salt.
In a medium bowl, whisk the thawed corn, egg, milk, and vegetable oil. Pour into the bowl with the dry ingredients and combine. Allow to rest for 5 minutes.
Preheat the oven to 200 degrees F.
In a cast iron pan on medium-high heat, add enough vegetable oil to fill the pan about 1/2-inch deep. When the oil begins to swirl, add the batter in batches to the pan using a small ice cream scoop or 1/4 cup measure to make each hoecake. Gently spread into a circle, if needed. Flip the hoecakes when the air pockets begin to pop on the surface of the batter and a peek underneath the cake reveals a golden rim and surface, about 2 minutes.
Once the second side is golden brown, transfer the hoecakes to a baking sheet in a warm oven and continue making the rest. Serve with maple syrup.