Use the create-a-tron to make a werewolf:
Round 1:
Wolf Part: Wolf
Moon: Moon
Human: Human

Round 2:
Wolf Part: Fang
Moon: Fullmoon
Human: Man

Round 2:
Wolf Part: Fur
Moon: Crescentmoon
Human: Boy

Scribblenauts Remix 12-3 Cheats Hints gallery:
12-3-1-a: Use the Create-A-Tron to make a werewolf.
12-3-1-b: A werewolf is a combination of what?
12-3-1-c: What turns a man into a werewolf?