Plastic or metal terradons ? also what part is being glued. ps. if it's the plastic ones, I have an idea... take a bit of longish sprue cut out of your scraps, and impale it into your foam block where you want it connected, (you may need to drill a hole first) I would hot glue this bit to the foam. them use regular plastic glue to connect your plastic parts.
Hmmm..... similar idea.... Except use a nail instead of sprue, and use some epoxy wield instead of plastic glue... Also you may have issues with your model being a bit top heavy. so plan accordingly.