PamPam maps can be indexed by Google, so people can find them by searching on Google.
In order to have them appear on Google search, make sure your map has the "Hide on profile & search" setting turned Off. This means your map will appear on your profile and will be eligible to be indexed.
Note that all PamPam maps are viewable by anyone with the link, even if the Hidden setting is turned On.
In addition to making sure your maps are not hidden, you should use best SEO practices. For example:
Give your map a clear and catchy title
Link to your map from various places: social media, blogs, etc. The more links to the map the better.
Give your map a clear description
Give your map a cover photo, this image will appear when people share the link
All of those practices will help with indexing your map on Google Search