EDIT: I just realised that these are Deadly Acid Splash, and not Blob. Didn't think there were two different acid kinds. So disregard if this doesn't apply, I suppose!
After a recent run of "Orcs 1" a pair of deadly acid traps were laid out among the loot when it was splitting time.
As I am not the one who picked them up in the first place (while gathering the loot), I don't know if they dropped from the quest itself or was already in someone's pack, but I can get to checking that up.
A heads up, nonetheless.