Many fruits contain a single seed, so here are a few examples:
Mango: Mangoes are tropical fruits that typically contain a single large seed, or stone, in the center.
Avocado: Avocados are known for their large pit or seed that is in the center of the fruit.
Cherry: Cherries are a small fruit that typically contains one seed.
Plum: Plums are another fruit that typically contains a single seed, or pit, in the center.
Peach: Peaches are a fuzzy fruit that also typically contains a single large seed in the center.
These are just a few examples, but many other fruits such as olives, dates, and apricots also contain a single seed.