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Well, technically it's a type of cactus (and prickly pear are really good for them), but the thing that would make me nervous is the fact it has those little seeds in it. I think the closest comparison to dragon fruit is the kiwi, which should be rarely fed to a dragon, IF AT ALL.
I'd recommend waiting for one of the resident experts to come around before offering it up to your little dinosaur. Better safe than sorry. Your little guy (or gal) looks too cute to take a chance.
The article states that it's high in fiber... I don't know what these measurements mean, I just threw it up there so that someone who knows how to speak health stuff can say weather or not there's too much phosphorus and fiber in there. I definitely would worry about the little black seed looking things though. I don't think those would do too well in the digestive system.
Based on that info, the calcium to phosphorus ratio would be enough for me to stay away from it. Even if you won a lifetime supply of dragon fruit, I'd keep it for yourself and not your dragon (despite the name).