Okay...
Count, the "Harvey" I was telling you about was (according to Xerus) the fat blue AM monster with big yellow horns, yellow eyes, pink nose, and fangs. Xeris said he was in a "Lost & Found" sketch (and many other places), not the "telephone" skit.
There are two Muppet eggplants; one is from TMS (with beady eyes) and one is from SS (w/ bigger, "cartoony" eyes).
As far as carrots (besides the giant ones), here are a few I remember:
--A thin real-looking carrot used on SS, with black eyes and (I think) eyelashes. The Palisades carrot w/ Waldorf appears to be based on it, but with beady eyes.
--A bigger carrot made a few years ago on SS. He's got Ernie-like eyes.
--I've seen a pack of carrots (only one which has a face) on "The Cosby Show: Cliff's Nightmare", but I have no idea where he originated.
And I'll check the "Classic SS" questions ASAP...