How many orcs did each of the Hobbits kill? (Sam, Frodo, Merry & Pippin)

If you are referring to the Lord of the Rings movies (not the books) and we take into account the extended versions on DVD/BluRay, the counts are as follows:

The Fellowship of the Ring:
Sam killed 3 Orcs by sword, none of the other Hobbits killed any Orcs although Merry and Pippin shared a kill of an Uruk-Hai.

The Two Towers:
Merry and Pippin each killed an Orc by throwing rocks.

The Return of the King:
(this one is trickier as it has the highest overall body count and the character kill breakdowns aren't complete)
Sam kills 4 Orcs, Pippin kills 1-2 Orcs, Merry has 7 listed kills but not specified what race.

Frodo doesn't appear to have killed any throughout the trilogy.

http://moviebodycounts.proboards.com/board/2/finished-counts?q=lord+of+the+rings