I've made a swimming troglodon based on the swamp variant I've seen from @Warden floating around here somewhere. Unfortuantly the plant-bits I had found turned out to not be all that good, so I can't hide my mediocre modelling skills as much as I would've liked. But it looks much better than I expected. Anyway, clearly the seraphon navy should exist of troglodons elegantly leaping from the water while spitting their acidic venom at the enemy ships.
My girlfriend finds it hilarious though, when we play she no has a horde of dinosaurs charging at her, and one just swimming through the earth