That worldbuilding info at the very end is really interesting. Yeah you don't want the animal you're trying to get rid of's natural predator to get driven away instead.
The dragon vs wyvern thing sounds like it has some interesting stories around it too.
It's also really nice how little things like this really breathe life into this world and make it feel really real. Like the common name thing has caused a lot of confusion irl.
I can't think of anything similar to the mole vs stoat thing, at least with english common names. But there's a myth/old wive's tale/urban legend spread around about "daddy longlegs" (Opiliones aka harvestmen) being extremely venomous "but their fangs are too short to bite people" also applied to "daddy longlegs" (Tipuloidea, aka mosquito hawks, crane flies), neither of which having any kind of piercing mouthpart (or stinger as the latter is sometimes given). This comes from there being a spider called "daddy longlegs" (Pholcidae, aka house spider, cellar spider, carpenter spider, vibrating/gyrating spider) from which this myth originates. These spiders do have shorter fangs but can still bite people (as proved on Mythbusters). (Actually another spider that has fangs like this is the Brown Recluse which we all know can definitely bite people.) Pholcidae venom is also not venomous to humans (Adam reported a "mild short-lived burning sensation", which sounds like my experience when I was stung by a sweat bee I accidentally smooshed so that will tell you how non-venomous they are (unless allergic, of course)). It's theorized that people assumed Pholcidae must be extremely venomous because they actively hunt other spiders that are, like black widows and Australian redbacks. In fact, their venom is barely even venomous to insects, as they rely mainly on their webbing letting them trap their prey until it finally dies.
[sorry for the wall of text lol]