TROG, the Test for Reception of Grammar, a therapy test to measure understanding of grammatical contrasts.

Royal Air Force jargon for armed patrol duties.

Cave exploration.

Wally Fawkes - aka "Trog," jazz musician and cartoonist.

Troglodyte - a cave dweller.

Trog - a 1970 motion picture starring Joan Crawford.

Trog (video game) - An arcade game (produced and released by Midway) involving cavemen, dinosaurs, and eggs.

A Trog is a type of frog-like enemy seen in the game Drakan: The Ancients' Gates.