For the term referring to a street seller of fruit see Costermonger

Costermonger

Costermonger, or simply Coster, is a street seller of fruit and vegetables, in London and other British towns. They were ubiquitous in mid-Victorian England, and some are still found in markets. As usual with street-sellers, they would use a loud sing-song cry or chant to attract attention...

.

A barrow boy is a person who guides a stretcher

Stretcher

A stretcher is a medical device used to carry casualties or an incapacitated person from one place to another. It is a simple type of litter, and still called by that name in some cases....

 during a crag rescue in British Mountain Rescue terminology. Conventionally there are two Barrow Boys, one at each end of a horizontal stretcher (though it may be vertical) which may contain a casualty

Casualty (person)

A casualty is a person who is the victim of an accident, injury, or trauma. The word casualties is most often used by the news media to describe deaths and injuries resulting from wars or disasters...

. The Barrow Boys may operate on fixed or moving ropes, and guide the progress of the stretcher to safer ground.