The word "legger" has a number of synonyms that can be used interchangeably with varying levels of context specificity. For example, "runner" is a more general term that could apply to someone who runs for exercise or sport, but might also apply to someone who is running errands or performing other tasks. "Courier" is another option that is more specific to delivery or transportation-related tasks. "Harbinger" or "herald" could also be used in certain situations where the person is announcing something or bringing news. "Scout" or "surveyor" could apply to someone who is examining or exploring an area on foot. Ultimately, the best synonym will depend on the specific context in which the word is being used.