Daboria is the fusion of Dodoria and Zarbon. How? Well it is stated in the Frieza Saga of Dragon Ball Z that Zarbon and Dodoria's power are equal (if you don't count Zarbon's second form). And since they were in the World Trade Organization, and since Goku was dead when he learned of the fusion dance technique from the Metamorans, which was between the Cell and Buu Sagas, which takes place years after the Frieza Saga, who's to say that the Metamorans weren't a planet that they terminated. It was. But before Zarbon did away with their leader, he ordered him to teach Dodoria and himself his most valuable technique, which was the fusion dance. So, while in hell, they perform it correctly and make Daboria. Daboria then breaks out of hell unknowingly, and in The Adventures of Goten and Trunks,