Apparently Crash and Coco were actually playing Crash Team Rumble in Crash 4's ending, suggesting a fictionalised version of Rumble that actually has local split-screen multiplayer. : r/crashbandicoot
Crash Bandicoot N Sane Trilogy | Hang Eight - Splitscreen Comparison - YouTube
Crash Bandicoot 4's Developers On Why This Sequel Has a Number, Its New Modern and Retro Modes, and More | VG247