Just about any 3d object will do in Bryce. sharecg.com has quite a few. My personal favorite is Toon Shark from Daz3d. It be made to look both silly and reasonably real…
In the submarine image you see several critters all of which came from sharecg, including a couple of sharks (look in the ruins).
And in the toon sharking being invited to dinner….
Click thumbnail to see full-size image