I actually host my doubts over this for two reasons.
One, Sammy Suckerfish/Big League Bob is still listed as under Season 14 by both streaming services and the wiki.
Secondly, the runtime to the Season 14 disc set (being two discs) is just under 5 hours. (
https://www.amazon.com/dp/B0DFZGPXQV)
Every regular episode has an estimated run time of 11 minutes, and there are 20 of those, which would be 220 minutes. That's 3 hours and 40 minutes.
Kreepaway Kamp got completely leaked. I will not share any spoilers (and I'm starting to think Nick should invest in security), but the total runtime of that special is 44 minutes. I'm going to assume Snow Yellow and the Seven Jellies is 24 minutes long, just by doing some other fancy math with the DVD run time.
That leaves me with aprox. 288 minutes, or 4 hours and 50 minutes. A whole 5 minutes off of what total run time actually is on the DVD, but remember, I was going by averages. The last two episodes to air for S14 will be Kreepaway Kamp, and Snow Yellow. Because of that, I don't have a hard time predicting that Snow Yellow is probably going to be the episode that airs directly before or (most likely) directly after KrK.
Season 15 has NOT premiered yet. Just correcting that for ya. But yes, they're splitting the season. It's dumb, but whatever. At least my S14 predictions can be finished with ease.