To be fair, polla only means dick in spain and not in any other spanish speaking country. Globalization though has spread this understanding of "polla".

In chilean, pico is dick as well, and most other spanish speaking country uses the word normally. So, even though chilean is sort of their own language, you should always be carefull with spanish.

I too thought it was similar to junji ito.

I remember the dune mini series blowing my mind as a kid.