The Fiji Dwarf is a good juice coconut. It's most admirable quality is that it bears fruit in about 5 years, when the fruit will less than 2 meters off the ground. It's oil content is lower than many other varieties so it is mostly a backyard tree and not grown commercially that I'm aware of. The Malaysian Dwarf is another popular variety here. It has a yellow fruit.
The Fijian name for this coconut, 'Niu Leka' actually means 'Coconut Short' but they eventually grow quite tall, 15 meters or more. Like most coconut trees, the trunk attains it's full girth before putting on significant vertical growth.
This is one of my 6 year old trees: