No. Not yet at least. Like lemmy, piefed is limited to just one image as the lead image in a post. You can embed other images using markdown in the body of the post, but it is just that first image that is shown in the feed until somebody expands/opens the post to see the rest of the post body.

Mastodon and some other fediverse software have image galleries that can be a post. Currently in both piefed and lemmy, just the first image in the mastodon gallery is used as the image for the post. It's kind of been a wishlist item for me to have some kind of equivalent gallery post type in piefed.