The 3-year-old, in German just called "K2" (abbr. Kind 2, thanks to @writingwoman, probably) makes up stories about a "Spikerman", someone at the Kindergarden must have told about that in a misunderstandable way.
Now I think of a man with silver or steel or platinum nails coming out of the body on demand everywhere, turning him into someone who solves all kinds of problems in arctic or alpine regions and finally becoming jobless due to climate change, living on selling his scrap metal.
Interested in a film plot? Ask me, and I'll be asking K2.