I think you're confused here...
Ireland is called the Emerald Isle, because its really green out
in the countryside. This is mainly because it rains A LOT! Iceland
is called Iceland, because its cold.
The Icelandic Króna, basically meaning crown.
What "form" you ask, it is mostly electronic, or used in paper
bills and thick metal coins called klink in Iceland.. I think it's
because the sound it makes. "Klink".