No
1 - folders in Photos only show albums and other folders - not photos - albums show photos
2 - when you import photos they go into the library and then you organize them - it is trivial to import a set of photos and open the last import album, select all and click on the + to create a new album with those photo - then go to the next set of photos and do the same
3 - if you have these separated into finder folders there is a user scrip to import finder folders of photos into albums with matching names - Import Folders of Image Files into Library as Albums - this also is available on Old Toad's web site as a compiled application - http://oldtoad.net/oldtoadstutorials/No.P01.html
Although in most cases for new photos this has no advantage over #2 - it is mostly for people who have not used a database before and used a file based organization and want to move that file based organization to an virtual albums based organization in Photos
4 - For previous imports the All Photos album is sorted by import date/time so it is again trivial to find and previous import - no need to search through hundreds of photos - just open All Photos and scroll to the desired import, select the photos in it and as in #2 click the + and create an album
LN