No, there are relatively few models that can do 4k 120fps. As far as I know, only Canon EOS R5, Insta360 pro2, Z Cam E2 can do said 4K 120fps. I assume upcoming Sony A7 S3 but that's way too early to mention. I'm sure there are other models or smartphone like Samsung Galaxy S20 Ultra.

The manufacturer's info can be found here: https://www.sony.ch/de...
Picture size (pixels), NTSC
XAVC S 4K: 3,840 x 2,160 (30p, 100m), 3,840 x 2,160 (24p, 100m), 3,840 x 2,160 (30p, 60m), 3,840 x 2,160 (24p, 60m) XAVC S HD: 1,920 x 1,080 (120p, 100m), 1,920 x 1,080 (120p, 60m), 1,920 x 1,080 (60p, 50m), 1,920 x 1,080 (30p, 50m), 1,920 x 1,080 (60p, 50m).), 1,920 x 1,080 (60p, 50m), 1,920 x 1,080 (30p, 50m), 1,920 x 1,080 (24p, 50m), 1,920 x 1,080 (60p, 25m), 1,920 x 1,080 (30p, 16m) AVCHD: 1,920 x 1,080 (60i, 24m, FX), 1,920 x 1,080 (60i, 17 mio., FH)
Picture size (pixels), PAL
XAVC S 4K: 3,840 x 2,160 (25p, 100m), 3,840 x 2,160 (25p, 60m) XAVC S HD: 1,920 x 1,080 (100p, 100m), 1,920 x 1,080 (100p, 60m), 1.920 x 1,080 (50p, 50m), 1,920 x 1,080 (25p, 50m), 1,920 x 1,080 (50p, 25m), 1,920 x 1,080 (25p, 16m) AVCHD: 1,920 x 1,080 (50i, 24m, FX), 1,920 x 1,080 (50i, 17 million, FH)
SLOW MOTION AND FAST MOTION (FRAME RATE RECORDING)
NTSC mode: 1, 2, 4, 8, 15, 30, 60, 120 frames per second, PAL mode: 1, 2, 3, 6, 12, 25, 50, 100 frames per second
SLOW MOTION AND FAST MOTION (FRAME RATE RECORDING AND FRAME SIZE)
NTSC mode: 1,920 x 1,080 (60p, 30p, 24p), PAL mode: 1,920 x 1,080 (50p, 25p)

No. No full-frame camera can do that. The ZRIII can only do 30p at 4k. Not even APS-C cameras can do that. Fuji's X-T3 can shoot 4k 60p. 120p only with Full HD.

This camera was a gift, so I don't know any information.
You may find the information in the instructions under slow motion and then continue searching
https://helpguide.sony.net/ilc...