I was told that the 3 African are split, 1 female and 2 males, but I was never told which was which. Is there anyway to tell? Or does anyone want to venture a guess?
Without knowing geese, but after reading the other responses, I think your 3 Africans are all the same gender as each other.
(One of the other posters said male, and the other said female, and they both had specific reasons for their answer. But neither one pointed out differences between one African and another.)
I did find an older thread where people were talking about sexing 2 African geese:
https://www.backyardchickens.com/threads/are-our-african-geese-males-or-females.1433747/
(They discussed various ways to tell, decided both were male, got confused when the owner found a goose-sized egg, and then the egg turned out to be a giant double-yolk duck egg instead.)
I found a page on a different website with a photo of a male & female African goose, labeled:
http://www.majesticwaterfowl.org/arthonks3.htm
I see the male is bigger in general, and has a much bigger knob on his bill in the photo.
Of course, differences like "bigger knob" are easier to spot when you have some of each gender to compare.
I've read that geese can be vent sexed, and I know it's possible to pay for DNA sex testing on any bird (iqbirtesting.com is one place for that.) If all three Africans are the same gender, getting a definite answer for just one could tell you what they all are.
Or of course you would wait and see if any lay eggs in the spring. How old are they?