Yeah, odd list. Bloat drones over helbrutes and knights over a lord of skulls makes me think it's just kind of a "here's some cool stuff" list. Which, hey, no complaints tbh
I traded pebbles for another horse early, picked up herring later, and went back to the first trader to find pebbles still there in the field. You can buy her back (and usually get money back when you do), so you're not locked out from her.