What is a medieval walker?

Answer 1

The only thing I could come up with for your question was stilt walking ( people walking on stilts) and people who walk labyrinths (circles to get to the center). The stilt walkers would be similar to a jester or juggler.

Answer 2

A walker is the same as a fuller, i.e. someone who cleans and thickens cloth often by walking on it - hence the name walker

Answer 3

In the middle ages, people walked to get to someplace they needed to be if it was close by, or if they did not own a horse or mule.