Chosen of Et-Nem-Tu? Really?! Cool!
Anyway, we won't be into Spelljammer for a long, long, long, LONG time. There are Hippo-men, but I doubt we'll meet any unless I feel like being silly.
I have the book. I don't have the time right now, though, and I'll need to consult my fellow DM on this one. You'll have your answer soon.