No no no. It's okay to talk about the secret, so long as you deny it if someone criticizes whatever "secret" action you're doing and you call them conspiracy theorists. ( https://en.wikipedia.org/wiki/Gaslighting )
Develop boghopper sub-themes. Look, Elves have illuminate, Dorfs have drunken, what do the boghoppers have? I'm 100% committed to supporting a Hippo module.
A beast subtheme would be pretty easy to flesh out, we have: Mentor Hippo rider Huntmaster Bloated toad Turtle rider Pygmy hippo stampede Huntmaster charm Feeding frenzy I already see a burst damage identity
It has to be part of something bigger, like the boghopper/beast submodule, because you can just buff him into something because generic tanks are covered already and the boghopper rider ability cuts on design space heavily.
That's all fine and well, but please don't make them into a beast theme like all the other factions with Boost, Drive, Commander, Summon: X. It should be something with a little uniqueness, something that says "Firk you I'm FS!" Like what do hippos do? Roll in mud? Maybe use mud. Dirt + Water = Mud AHA Mud