Fully thaw the spinach and squeeze all liquid out.
Mix the spinach, eggs, ricotta, ground meat, ½ cup marinara, and ¾ mozzarella in a bowl.
Lay a lasagna sheet out and spoon ⅓ of a cup of the filling onto the sheet.
Spread the filling out leaving about ¾ - 1 inch of space on each sode.
Roll the lasagna sheets making sure none of the filling squeezes out.
Spread some marinara sauce onto a baking tray and place the rolls in the tray. You should get 12 rolls.
Spoon some marinara sauce onto all the rolls and cover and bake for 35 minutes.
After 35 minutes, sprinkle some mozzarella onto the rolls. Leave uncovered and bake for 5 more minutes.