Combine buttermilk and oats in a large bowl; let soak for 5 minutes. Combine flours, brown sugar, wheat germ, baking soda, cinnamon, and salt in a large bowl. Whisk eggs, applesauce, and green food coloring into the oats mixture. Add more green food coloring if desired. Stir in flour mixture until batter is just moistened. Preheat the oven to 200 degrees F (95 degrees C). Heat a lightly oiled griddle to 350 degrees F (175 degrees C). Pour batter onto the griddle using a 1/3 cup measure. Cook until bubbles form and the edges are dry, 3 to 4 minutes. Flip and cook until browned on the other side, 2 to 3 minutes. Place pancakes on a baking sheet and keep warm in the oven. Repeat with remaining batter.