Wash hands with soap and water.
For the sandwiches, use a circular cookie cutter on the bread, cheddar cheese, and turkey to make circles.
Stack the bread and turkey into a sandwich with the cheddar cheese on top (see photo).
Cut the dried edible seaweed, white cheese, or turkey into the desired face shapes and place them on top of the sandwich (see photo).
Gently rub strawberries under cold running water. Dry with a clean towel.
For heart-shaped strawberries, use a small heart-shaped cutter, or cut the strawberry in half and then shape it into a heart by cutting a triangle notch out of the top. Place the strawberry in vanilla yogurt.
For the poop emoji cookies, roll brown fondant into a long "worm" shape. Swirl together into a cone shape. Make a small mouth out of white fondant, and add the googly eyes. Use a little water to help everything stick together. (see photo)
Set the poop emoji on top of the cookie. To fit them into the lunchbox, you might have to trim or break the cookie (see photo).
Serve immediately or refrigerate the lunchbox.