I do not think Samuel etoo played in a world cup as Cameroon failed to qualify in the past two world cups.
Samuel Eto'o played for Cameroon in the 2014 FIFA World Cup.
Samuel Inkoom played for Ghana in the 2014 FIFA World Cup.
Samuel eto'o fils
1974 FIFA World Cup.
1950 FIFA World Cup.
1998 fifa world cup.
Argentina played in their first world cup, way back at the first world cup in 1930.
In the 1996 FIFA World Cup Qualifiers.
Azteca Mexico by Adidas was the official match ball of 1986 FIFA World Cup in Mexico. It was also the first fully synthetic FIFA World Cup ball.
No, Ronaldinho was not selected to play on Brazil's team for the 2014 FIFA World Cup.
There are none. There is no FIFA World Cup pool tournament.