They are definitely not “ducks”, nor do they have any relation to “geo”-logy. In fact, they seem alien enough to be “from Mars” and, for all I know, possess a malign intelligence.
They are found mostly around Pacific Coast of the US and Canada, and in Japan they seem to serve as inspiration for “manga” of certain tentacled variety.
Modern biologists easily classify it as large saltwater clam, a bivalve mollusk with a huge “neck”, or a “siphon”. How huge, you’ll ask? Up to two meters in length.