Oh yeah there are tons of great, high-level YT channels dedicated to Splatoon! ThatSRB2Dude, Squids Next Door, Imperious FiveLeafClover, Squidkids, Nintendome, 2dos, TouFool31, and much more!!
Yes, I would also recommend watching FiveLeafClover, 2dos, ThatSRB2Dude, and Squids Next Door all on...