“Third Place Donald” would be a good moniker.
Of course you could call him Mr. 4th place with Vermont and Massachusetts.
Reminds me of the old Miller Lite commercial with Ray Johnson
Instead Cruz would say "You can call me 3rd" or "You can call me 4th" or "You can call me 2nd runner up" or "You can call me 3rd runner up", but you doesn't have to call me truthful.