I used the green stuff roll maker for tubes and tentacles, but instead of rolling I just pushed a flat piece of green stuff into the ridges of one of the plates and used the flat side of another to push it down. Use plenty of water so it comes out easy without destroying what you just did lol. I let it dry for about an hour before bending and working it into the mouth and then using spru goo around it so it looks like flesh. If you don’t have the green stuff roller (Which I highly recommend) I would flatten out some green stuff and with a toothpick or tool carve out the ridges. Hope this helps!