Does 2012 Prius Two have a differential?

There's no separate differential, no distinct gear oil replacement. Maybe download the pdf of the Toyota publication "Warranty and Maintenance Booklet". One source, under the "Manuals" tab. All the fluid changes Toyota wants are noted in there, albeit in hard-to-read, event-by-event format. Attached is a spreadsheet summary I've put together, both as-is, and extrapolated to 240k miles (Toyota stops at 120k).

What's the miles on it now, btw? I'd also consider these, mostly not in the Toyota schedule services:

EGR cleaning
Transaxle fluid change
Brake fluid change
Brake inspect/clean/lube (sort of in the schedule, very understated though, every 30k miles, but oft ignored)

 

Pretty much all front-engine, front-wheel-drive cars combine the transmission and differential into a single contraption, and call it a 'transaxle'.

The places you drain and fill the transaxle oil cover the whole works.