Those guys in graphic novels green making apperances in Red and Yellow having his own.
No, Green and Yellow from the Pokemon Manga cannot be found in Pokemon HeartGold. The only characters that are in the game from the Manga are Red, Blue, Silver(your rival) and Gold which is yourself. I hope this helps. Here are all of the characters from the Manga series:
http://www.serebii.net/manga/characters/
