There's an actual Proto Armor FATE in the Shroud as part of the Sylph beast tribes. If you've ever leveled them up you know cuz it's a pain waiting for it to spawn. Basically, the Reaper M-tek armors are the Proto Armor/Fortis variation on the armor, which is based on Amano's design, and the Predators are classic M-tek Armor/Mega Armor/Dueller design we see more commonly in FFVI.

Pipsqueaks I'm not really sure about. They are actually properly translated Onion Knights, so we do have that reference in the game already (although the other two variations Tomb Thumb/Onion Dasher and Iron/Metal Hitman can still be used namedrop-wise), and I'm not sure if they are actually mechanical or just some sort of little person. It's a weird enemy, which is all the more reason to use it lol.