Plugin for freestanding dropdown menu?

Hi there, I’m moving this site over to WordPress. https://beakersparrotplace.com/parrotgallery-misc.html

I want to add a dropdown on the Gallery pages allowing people to use it as a shortcut to get to the other pages. Does anyone know if there’s a plugin that will help me with that? All the plugins I’ve looked at so far are for dropdowns for the main navigation or as a widget in a sidebar. I’m not using a sidebar.