At Pam's Pumpkin Palace café
Every dish – from soufflé to sorbet –
Is prepared with panache
And is made with said squash.
Not the pie, though; that's far too cliché.

The pumpkin (Curcurbita pepo),
Is a favorite from here to Aleppo.
He's the squash world's buffoon!
In a veggie lampoon
He'd play Harpo.  (Zucchini'd play Zeppo).

Based on the suggestion: “pumpkin”

Fun fact: both pumpkins and zucchinis are classified as Curcurbita pepo (along with many other types of squash and gourd).