D&D Giants, regardless of edition, are very big. As such, thats what my group called them after our first encounter with creatures standing between 1 and 2 stories high. In many cases this is only slightly taller then a Human, Male, Fighter standing up in the back of a wagon. They were Very Bigs. There were Hill Very Bigs, Frost Very Bigs, Cloud Very Bigs, etc.
Giants entered the picture sometime later when I had a PC trip and fall into a footprint one of them left. It was a Giant that lifted the blacksmith's house off the ground and shook it to get all the people and metal out before he used it as a hat. Think Time Bandits. That's a Giant.
AD
Barking Alien
"Once upon a time there lived the Littlest Giant...Why, he's barely huge! He's not much bigger then a house!...And the Little Giant's heart was filled with blood..."
Ren and Stimpy