Of course it can.
no
No, its a land locked country
Yes.
Sudan
False. Greece is not a land-locked country, as it is surrounded by water on three sides: the Ionian Sea to the west, the Aegean Sea to the east, and the Mediterranean Sea to the south.
Laos
Moldova
No, Switzerland is a land-locked country.
No, it is an island!
Switzerland is the only landlocked country in the question's list.
Chad, Mongolia just to cite landlocked countries. Israel, Tunisia if the definition of "ocean" is stricto sensu (they are bordered by the Mediterranean Sea, not an ocean). Only some island countries (Australia, etc..) are "surrounded" completely by water.
land-locked