Biathlon, Cross Country Skiing, Curling, Luge, Nordic Combined, and Ski Jumping.
Nordic combined and Biathlon.
Ghana has never won a winter Olympic medal.
Biathlon.
According to the olympic website, the US has 3 events it has never won a medal in----I know one of them is Handball, but do not know the other two. Through the 2006 Winter Games, the U.S. has never won a medal in biathlon and nordic combined. Through the 2008 Summer Games, the U.S. has never won a medal in handball, table tennis, rhythmic gymnastics, and badminton.
iceland
Albania have never won a Winter Olympic medal as they have never entered the tournament before. However there is a competitor/s taking part in the 2006 Turin games, though in which sport I am not sure.
As far as the Winter Olympics are concerned, Germany has never won a gold medal. Their best finish was 3rd (bronze medal) at the 1932 and 1976 Winter Olympic Games.
Bangladesh
Albania
Singapore has never hosted the Olympic games
Mike Tyson never won an Olympic medal. He lost to Tyrell Biggs in the trials.
India