None start with "O". Oslo is the capital of the Scandinavian country Norway.
None of the Scandinavian countries have a name with only three letters.
Denmark, Sweden, and Norway.
Norway
Sweden.
Greenland
Sweden
Norway
The proper name, a Scandinavian country, is Norway.
Norway, Sweden, Denmark, Iceland.
Sweden is the largest Scandinavian country
Denmark is the southernmost Scandinavian country.