Sugar-apple or sweetsop or Custard apple is the fruit of Annona squamosa, the most widely grown species of Annona and a native of the tropical Americas and. Custard Apple or Atis is a very popular fruit in the Philippines. It is also called as Exotic Fruit Market offers fresh exotic and tropical fruits since. Find this Pin and. It was a sugar-apple and it was exceptional. The sugar-apple also is known as an anón, because it comes from the annona squamosa tree. And other times you may hear it called a sweetsop or custard apple.