Cut french bread in one-inch slices and place on large baking sheet. Sautee ramps, white parts and leaves, in olive oil in a large frying pan on medium-high for about 5 minutes. Remove from heat and add tomatoes, basil, and season with salt and pepper to taste. Combine well; spoon mixture onto french bread slices and top with Parmesan. Broil for a few minutes, till cheese melts and edges of bread slices crisp.