squash

[Rankin, Robert L]

Yes, when something innovative comes along the term can spread like wildfire.  The 'firewater' compound for distilled spirits is a useful example.  It's recent, but it's extremely widespread in both Algonquian and Siouan.  There's probably no need to point to neologisms in European languages.
 
B.
 
> Miami and Menominee would have developed from such backwater dialects, while most other languages would have patterned their usage on that of the koine.

And of course, if gourd use goes back much farther than squash cultivation, that removes the worry about having to time this event as recently as the mid first millennium AD.

Rory