the.com/toy soldier

A miniature warrior who always follows orders, mostly because he can't move his arms.

means A small model of a soldier, often made rigid and upright, used as a toy or collectible figure.

from Simple compound of 'toy' (a plaything, from Middle English/Middle Dutch roots meaning amusement or trifle) plus 'soldier' (from Old French soudier/soldat, ultimately tied to the Latin solidus — the coin used to pay fighting men). Miniature soldiers as playthings go back centuries, with tin and lead versions becoming especially popular from the 18th and 19th centuries onward, often modeled on real regiments. The phrase itself is just descriptive — a soldier, but toy-sized — though it later picked up a figurative life describing anyone stiff, obedient, or incapable of independent action.

origin
Tin figures date back to 1730s Germany
nutcracker link
Tchaikovsky immortalized them marching in 1892
collector term
Flat ones are called flats, obviously
material shift
Lead gave way to plastic after WWII safety scares
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