Originally drawn by https://www.furaffinity.net/user/00aa and drawn via
https://www.furaffinity.net/user/thetradingpost

Here is their drawing of the original source of Marty Carrots except for a few minor differences.
1. This is bipedal and the original plush is quadrupedal
2. the diaper is a disposal one instead of an old sock
3. their is no dirt and grime on this one
4. did not originally come from the Smith's in Edgewood