I had never heard of this. But obviously it has been heard of...
November’s Full Moon will be on November 30, 2020, and it is known as the Full Beaver Moon. This was the time to set beaver traps before the swamps froze, to ensure a supply of warm winter furs. Another interpretation suggests that the name Full Beaver Moon comes from the fact that the beavers are now actively preparing for winter. It is sometimes also referred to as the Frosty Moon.
Sources are Google & Farmer's Almanac
Who knew???