I don’t believe there actually needs to be a catchy name for a scandal name to catch on. Exhibits A through Z to prove that point is “Email Server.” If those somnific words can become the go-to name for Hillary's (non)scandal, just about anything could catch on as a scandal name.
But for any scandal name to catch on, there needs to be unanimity. Journalists across all media would need adopt one scandal name, such as Trump-Russia, and that would become the de facto scandal name. With different names currently in play, one scandal name to rule them all will never come to pass. And that would be a shame, as the evidence is clearly pointing to the greatest scandal of our time and it deserves unrelenting attention.