DaisyI said:No, not a Dragon Fruit. Its a Dogtail Cactus (Strophocactus testudo}
DaisyI said:As this plant will live inside, a sunniest window.
Dog-Tail Cactus (Deamia testudo)
OrchidBob said:I have seen community pots of baby yellow dragon fruit which look exactly like this.
If this plant starts to segment. (grow branches) or (link sausages) it may be dragon fruit.
Once it flowers you will know.