Who is…
Og
Hebrew: עוֹג —transliteration: Og —meaning: gigantic
Og was an Amorite king of Bashan, and the last of the Rephaim. His capitol city was Ashtaroth.
He was defeated by Moses in a pitched battle at Edrei, and was slain along with his sons (Deuteronomy 1:4), and whose kingdom was given to the tribes of Reuben and Gad and half the tribe of Manasseh (Numbers 21:32-35; Deuteronomy 3:1-13).
His “bedstead” (Deu. 3:11), bed or couch was of iron (or ironstone). Assuming a cubit of 18 inches, it was 13½ feet by 6 feet (9 cubits in length and 4 cubits wide). If the cubit size was based on giants, then the size in feet would be larger.
His overthrow was celebrated in song (Psalm 135:11; 136:20).
The Book of Amos may be referring to Og where it metaphorically says,Yet it was I [YHWH] who destroyed the Amorite before them,
Though his height was like the height of cedars,
And he was strong as the oaks;
I even destroyed his fruit above and his root below. —Amos 2:9