Sadly, as far as I know, they're exclusive to 3DS and old-gen console. I'm very sad about that because orcas are my favorite animal.
In Terraria, Orcas are just powered up sharks. They do nothing special, are rarer than sharks (which are already pretty rare), and they drop nothing special. There was no reason to keep them in. They're just resprites with no actual changes, like the other Old Gen enemies.in real life orcas are actually dolphins and there special to me. I only see sharks and pink jelly fish and crabs in the ocean right now on my switch. And orcas are special