Perry miniatures crusaders are a very good fit, Tanatus miniatures too but maybe a little bigger compared to the early LOTR plastic figures. Ebob has some Normans that fit the bill.
I believe Fireforge plastic Russians fit well too. Maybe nice for men of Dale or Laketown, cheap too.
Oh, and I heard the Footsore Normans are a bit smaller than usual for them, so maybe you are in luck there!