This is a Mang Cụt tree I think. I love its fruit the most. And it is also among the more expensive kind of fruit in South Việt Nam. When I was back last time, 1kg of this fruit was around $2USD....whereas 1kg of Chôm Chôm would cost around $0.2USD! But I'd love to eat as much Chôm Chôm anyway....:) Love them all.