Sure, Talokan is in the comics. It often plays a crucial role and adds depth to the overall narrative. Different comic writers and artists might present it in slightly different ways, but the core concept remains.
Namor isn't Asian in the comics. His character has been established with a specific ethnicity and origin that's not Asian. This has been consistent throughout the comic series.
Namor wasn't Mayan in the comics. His character has a distinct and established backstory that doesn't involve being Mayan. Usually, his heritage and roots are presented in a specific way within the comic universe.