Græn-gola

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

græn-gola

að, to be yellow-green, of deep water; grængolandi hylr.

Possible runic inscription in Younger Futhark:ᚴᚱᛅᚾ-ᚴᚢᛚᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements