They are classic set, though DoA was changed from his original form (3/3 body) before any of the expansions came out. And that is indeed what I was going for at first. I conflated Vanilla WoW with "Vanilla Hearthstone" for some reason in that context.
There's no question that Huge Toad is a better 2-drop beast than Bloodfen Raptor, but I still think the only reason those are considered "vanilla minions" is because there aren't true vanilla minions in those categories. What would you say to a 3/3 for 2 with no text? But, they haven't printed such a card in any mana slot (again, unless you count Wisp, which I don't). The most they will do is add 1 stat, but for some reason they have no problem occasionally adding other stuff on top of that improved stat line.. or they print cards with +2 stats and crushing drawbacks like the new Arcane Golem or that Rogue Ambusher card.
Well, if we are to look at "vanilla set" minions that still see play, there are plenty.
Argent Squire (zoo/aggro), Abusive Sergeant (zoo/aggro), Southsea Deckhand (rogues as a finisher), Doomsayer (control), Loot Hoarder (some deathrattle rogue decks), Wild Pyromancer (pally/priest), Coldlight Oracle (mill decks), Harvest Golem (deathrattle decks), Earthen Ring Farseer (rogue), Acolyte of Pain (warrior/control), Defender of Argus (zoo/aggro pally), Dread Corsair (tempo/patron warriors), Violet Teacher (miracle rogue) Azure Drake (rogue/dragon decks/midrange decks/Tempo Mage), Harrison Jones (control/midrange), Sylvanas, Ragnaros, Sea Giants.
That seems like plenty of "vanilla set" minions being played, and that's only counting neutrals. Also not counting cards that were nerfed out of usage in constructed decks like Ironbeak Owl, Molten Giants, or cards in a deck archetype that isn't played very much anymore (handlock played Twilight Drakes and Ancient Watchers in the past as well).
3/3 for 2 would be way too strong, it will never happen without some kind of penalty like overload, and for that we have Totem Golem. Huge Toad has a deathrattle that deals 1 damage, King's Elkk can potentially draw you a card. Raptor and Crocolisk simply do nothing.