Fourthing craft foam; it's helped me with so many projects. It's pliable and can be painted and can be anything from horns to armor if you do it right.
Second choice is Model Magic clay (it's a bit pricy if you get the small pouches though)
Wonderflex might also do the trick but I've never used it.
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Second choice is Model Magic clay (it's a bit pricy if you get the small pouches though)
Wonderflex might also do the trick but I've never used it.