I think I read their are many types of dwarf coconuts... Mapraow NamHoom, Fragrant Thai coconut has many dwarf varities, however they are nothing like the dwarf Samoan/Fijian ( I assume the same?? ) In Hawaii they called them Dwarf Samoan. I have seen some Namhoom Dwarfs that have coconuts going to the ground, and big wide trunks, but the planting conditions were extremely well, with huge tilled mounds, water troughs on both sides, heavy fertilizer, etc...
I plant the NamHoom dwarfs on my property and advantage is they will set flowers in year 3, no longer than year 5, and they are only a 5-6 feet tall at this point. I'll take a pictures of one of my dwarfs later today. In year 8-10 they get skinny and tall just like other coconuts, they really start to take off eventually.