What is the Swedish name for grandma and grandpa?

It's different, it depends on who you are talking about, if it is your fathers parents you are talking about it's called:

Farmor = grandma

Farfar = grandpa

If it is your mother's parents:

Mormor = grandma

Morfar = grandpa

It's really simple, mother is called "Mor" and father is called "Far" so you just put the two together "Fathers mother" = Farmor :)