It is hard to find a nylon string tenor guitar, it seems 99% are steel string
tenor guitars don't use nylon strings, unless it's a hybrid custom made thing
like the 'steel string baritone ukes' are pretty much small tenor guitars, and a
nylon stringed tenor guitar is really more or less a larger baritone (if someone custom
makes this). What defines the difference to me is tuning, strings and technique.
Tenor guitar uses 5th's (although some use DGBE but its not traditional) the technique
is totally different and it evolved from the tenor banjo and has steel strings and a larger
body. Baritone ukulele uses nylon strings, DGBE tuning 5 semi tones lower than a low G tenor
and the playing style you would play just as you would a tenor uke its just lower.
I have a 'steel stringed electric baritone ukulele' some would argue its a tenor guitar
because of the steel strings and it has a longer scale than most baritones 22" the longest
baritone i have seen was over 21" almost 22. But i play it like a baritone ukulele technique wise
and it was designed for baritone ukulele players in mind to convert from acoustic to electric.
Anyway thats the good thing about specialty and custom built instruments it opens up
a world of new musical inventions that mass producing companies never would think of.