Fourteen Republican presidential candidates, and three Democratic presidential candidates, will appear on the Tennessee major party presidential primary ballots. See the list here.
The most crowded past Republican presidential primary ballot had ten names on it. Tennessee presidential candidates are put on the ballot automatically if they are discussed in the news media. Also candidates can submit 2,500 signatures, but no one did that this year.
I find it surprising that Rocky de le Fuente was able to file some 22,000 signatures in Michigan, yet failed to submit the 2,500 required for Tennessee.