What should the assistant manager call?

You can call it a shop assistant. Shop assistant is a relatively simple name, used in small shops, convenience stores and other institutions. The duties of the clerk are similar to those of the deputy store manager, and they also assist the store manager in managing the daily operation of the store. The scope of work and responsibilities will be relatively small. The responsibilities and authority of the assistant manager may be different in different institutions and regions, so the title will be different.