Custard apple, is a common name for a fruit, and the tree which bears it, Annona reticulata
Custard apple may also refer to similar fruits produced by related trees:
Annonaceae, the custard apple or soursop family.
Annona cherimola, a tree and fruit also called cherimoya.
Annona squamosa, a tree and fruit also called sugar apple or sweetsop
Annona senegalensis, a tree and fruit called wild custard-apple
Casimiroa edulis, also called white sapote, a fruit related to the citrus.
Thanks to wikipedia.org