Name: Frosti or Jøkull
Father: Kari Fornjotsson
Son: Snær den Gamle (Snow the Old)
King of Kvenland, in modern Finland.

NOTE - another Frosti, father of Skjalf, is also listed on Geni as "king in Finland". Likely not the same.

His legend comes out of the "Orkneyinga Saga":

Fornjot had three sons; one was named Hler, whom we call Ægir, the second Logi, the third Kari; he was the father of Frost, the father of Snow the old" (quoted from http://www.sacred-texts.com/neu/ice/is3/is302.htm)

Another version is recorded in the "Flateyjarbok", "Hversum Noregr Byggdist" - here, his name is Jokull, son of Kari, father of Snæ: "Fornjot het en mann og han hadde tre sønner. Den første het Hler, den andre Logi og den tredje Kåri. Sistnevnte rådde for vinden, Logi for ilden og Hler for sjøen. Kåri var far til Jøkul, far til kong Snæ"

See:

http://en.wikipedia.org/wiki/Sn%C3%A6r
http://en.wikipedia.org/wiki/Hversu_Noregr_byggdist
Note: The old, but still popular, LDS gedcom, and gedcoms derived from it, have WRONG information about this person. They list Frosti as father of Jøkul, denoting them as two different persons. There is no known source that supports this speculation.

http://www.celtic-casimir.com/webtree/3/2819.htm Born: Abt 240, Finland Married: Abt 274, Finland

Ancestral File Number: 18JX-66C.
Marriage Information:
about 274 in Finland.

http://www.celtic-casimir.com/webtree/3/2832.htm Born: Abt 210, Finland Married: Abt 239, Finland
Ancestral File Number: 18JX-68R.
Marriage Information:
about 239 in Finland.

https://www.genealogieonline.nl/en/stamboom-homs/I6000000002665380834.php

Barn:
Snø "Den gamle" Jokul-/Frosteson, född cirka 245-291