alligator apple

From the fact that American alligators sometimes eat the fruit.

alligator apple (countable and uncountable, plural alligator apples)

1. A tropical fruit tree, of species Annona glabra, that grows in swamps in the tropical Americas and West Africa.

   Synonyms: pond apple, swamp apple, corkwood, bobwood, monkey apple

2. Fruit of Annona glabra, oblong to spherical and roughly apple-sized.