No, a timeout can not be called until the player with the ball is down or out of bounds.
A trip.
You tackle the ball, not a player.
No. In Professional Football, in order to be "down" a receiver has to be tackled or in your scenario touched by a defensive player while on the ground.
Receives the ball from the center, and either runs with it or passes it to another player. And they get tackled. A lot.
any player on the offensive team
I would imagine this is (offensive coordinator) A coach Not a player
In the game of American football, an offensive lineman is a player who is primarily responsible for blocking.
Reception
American Football...
Either the referees will call a dead ball or the defender tackles him on the field. Sometimes it's pretty rough when a guy gets tackled.
It's when an offensive player blocks and knocks over a defender.
No, the offensive line can't catch a pass