Combine the cream cheese, crab, and scallions in a medium bowl and fold with a spatula.
Lay one wonton wrapper out on a cutting board (keep the rest under plastic wrap or a damp towel) and place a small amount of filling in the center (about 1 1/2 teaspoons).
Moisten the edges with a wet fingertip, then seal by either folding it in half in a triangular shape, or by pushing the four edges in towards the center to create a four-pointed star. Be careful not to allow any air to remain inside as you seal them.
Transfer to a large plate, cover loosely with plastic wrap, and repeat until all of the filling is used.