The first reference shows the translation commonly utilized: Cabeços de Amarração is the name used for a specific model of mooring pins (PT-BR), the pillar styled, given the name of Bitt. The second reference shows the definition of bitt itself.

Mooring bitt is the pair of pillars. I believe the "post" is the pillar itself, and the forward post means the one in the front.

I've suggested "cabeço de amarração" (singular) because one cabeço is one pair. They usually come in two pairs, and that's why we usually call them cabeços, or bitts instead of bitt.