@TexasUberAlles
Here, “Foals” are “underage characters”. The Cutie Mark Crusaders are “underage” so any explicit images with them on it should be tagged “Foalcon” unless they are “aged up”.
“Foal” is a very easy to use generic term for “Underage Pony”. Splitting that into greater granularity by inventing new terms for fillies and colts that is also universal and not gender specific seems like an effort that doesn’t really provide any benefit.
And given that “fillies” and “colts” are also “foals”, it seems that trying to create more granularity for age (which isn’t specified clearly by the show) is only going to create confusion and arguments that can’t be resolved.
“Foal” is objective, doesn’t suffer from the show’s lack of clarity as to the specific ages of characters, and terms using “Foal” like “Foalcon” also applies to other species, like dragons, as well as horses.
It’s also
how the term is used on things like the MLP Wiki
So, “Foal” seems pretty useful just as it is.