I thought the Ka Po' Tun leader was referred to as a dragon in a metaphorical sense. The Akaviri, like the ancient nords, revere dragons so calling their leader a dragon is basically a way of saying he embodies the qualities they see in dragons.
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@Danikat, it's a little controversy here as nobody is sure if Tosh Raka (R-aka-Tosh) literally turned into a dragon or it is just a metaphor. We may never know the truth until we meet him in a game. There where some instances in which so-called "metaphors" turned to be real, that why with TES you will never be sure about the legitimacy of a story.