The nav menu item and the page heading should say “List of pumpkings” and the list should say “Registered pumpkings” (or maybe “Registered pumpkin holders”).
Arguably the action itself should have been called who_pumpking (note the “g” at the end) (see “pumpkin” vs “pumpking” in perlglossary) but we can just retcon “who_pumpkin” as meaning “who has held the pumpkin“.