Cut round cookies in half to make wings. Set aside.
Use a knife to cut a “chunk” out of the side of one marshmallow fudge cookie. Make sure the divot is large enough to fit the half round cookie. Repeat on the other side to create a second cavity for a wing.
Add chocolate chips to a resealable sandwich bag but do not seal. Microwave for 60 seconds at 50% power and knead until smooth. Snip the tip of the bag and use it to pipe chocolate onto a wing tip and place the wing into the cookie. Hold for a few seconds so the chocolate begins to set. Repeat with the second wing.
Cut a small piece of candy corn and cut it in half so you have a small set of “teeth.” Use chocolate to pipe onto the cookie for teeth and add eyes as well.
Repeat until you have the desired number of cookies.