The Norse did not have the same concept of "good" and "evil." So, there was no evil giant. They believed in Order and Chaos, and neither extreme was appreciated. Niflheim is the realm of extreme Order (ice), stasis, never changing, fixed and prevented any form of growth. Muspelheim is the land of Chaos and fire, constant creation and destruction. Its balance between the two that was seen as good.
As for the giant you may be referring to, I would probably say Surtr, the leader of the Sons of Muspel. He is a fire giant, and epitomizes the force of chaos.
Though considered a god, Loki was actually a giant.
Loki. Though considered a god, he was actually a giant.
Ymir.
Loki.
Loki. Though he was considered a god, he was really a giant.
trolls
Some races in Norse Mythology are Elf, Dark-elf, Jotun (giant), dwarves, and humans.
Ymir
Yggdrasil was the Norse world tree in mythology. But it was not an evergreen. It was an ash tree.
in Norse mythology fenfir was a giant wolf that was dangerous even to the Norse gods, so they tricked him and chained him up
Ymir, the frost giant, was the first living being.
Yes, he amounted to being an Evil God in Norse mythology. It is pronounced- Loke- Eye, by the way.