Carrot was a character who appeared in Muddy Buddy. MysteryPotatoMan said that he didn't care about him, due to his frustration with Orange. Pear says he was just kidding, while Orange uses the air horn (trying to "cheer him up"). In Frankenfruit, he was caught by Frankenfruit, and when Frankenfruit was attacked by the Halloweenie, he was possibly eaten...
"Well, I don't care for you either. (cries)"
If the viewer looks closely at the Halloweenie attack, one of the carrots escapes and survives. It means that he or the other carrot could appear in a future episode.
The Achievement Leaderboard has created a badge for this character called No Fans and is in the category track, and can be awarded to you by registering and add a page to a category. It is a bronze medal, meaning it is worth 10 points.