OK, it's not a Giant, but at 80mm tall, it's certainly big enough and they featured as giants in a battle shown in the Third Edition rulebook.
Painter:
William Breden / Andrew Taylor / Rochie Rochfort
Released:
May 1985
FF27 Fighting Fantasy Ogre
FF27 Fighting Fantasy Ogre A
FF27 Fighting Fantasy Ogre B
FF27 Fighting Fantasy Ogre C