The term "towhead" refers to a child with blonde hair. Does anybody know where this term originated?

A towhead is a person with very light, blond or yellow-colored hair. The adjective form is towheaded, and either word may be hyphenated as in tow-head and tow-headed. Towhead is first seen in 1830. Tow is another word for flax, jute or hemp that is ready for spinning. Flax and hemp that is prepared for spinning is light-colored, hence a person with hair that is exceedingly light-colored or yellow would be a towhead.