I was always confused as to why Greendog never got re-released by SEGA, but turns out - they don't own it. It's a character based on an obscure board game called "Surf Trip" by Cam de Leon.
https://boardgamegeek.com/image/1746755/surf-trip-the-board-game
Here are the GIFs.
https://drive.google.com/open?id=1UEd86ta-TYOjpex0Ag_c-9Q4Nqo4LsXS&usp=drive_fs