Acorn legs?

This window display looks like a strange, associative word puzzle.

Disembodied legs and acorns?  I don't get it. Ankle scales? Acorn knee? My brain keeps trying to
solve the puzzle, even though I know it's not a puzzle.


This post's theme word is lignify, "to convert into wood," or "to become wood or woody." The baby oak window display lignified my mind.