The hitter...
Shawn Crahan
In baseball, the bat is used to hit the balls thrown by the pitcher.
the big Samoan guy
A trench club.
Shoeless Joe Jackson called his baseball bat "Black Betsy"
The thick part is typically referred to as the barrel of the bat.
Hittersinc is a company that sells the R161 model baseball bat. It features a thick handle and a large barrel, and costs $69.99 as of October 2014.
Its called a bat.
Everyone's Hero.
Bat Bag
It is called the cupping of the bat, used for weighting.