my mother had a Zayde. Her other grandfather passed before she was born. I don't know what my father might have called his one grandfather who passed when my father was 3, the other one had passed away well before he was born.
Both of my sets of grandparents were grandma and grandpa. Pronounced without the d by me. But since one set lived 5 blocks away and the other set many states away, in practice the out of state ones were often referred to as "grandma and grandpa in ..." name of state when we were talking about them