Preheat oven to 375°F. Spray an 8" round cake pan with cooking spray.
Heat olive oil in a large skillet. Add green onions and cook, stirring, until softened; about 3 minutes. Add tomato and sage to pan, cook until the tomato is soft; about 3-4 minutes. Add spinach and cook just until it starts to wilt. Remove from heat and allow to cool.
Unroll crescent roll dough. Separate into 2 long rectangles, side by side. Place the edge of one rectangle over the other, and press together until completely sealed.
Pour spinach and tomato mixture onto top of dough. Sprinkle with cheese and pepper. Starting at one long end, roll dough up like a jelly roll.
Cut into 8 slices. Sprinkle tops with salt and arrange cut side up in cake pan. Bake for 20 minutes, or until puffed and browned.