A young or small forestar (likely a lookout or guard posted in front); a young sentry or scout.
From 'forestar' (one positioned in front) + '-ling' (diminutive suffix meaning small or young). The '-ling' suffix suggests a junior or youthful version of the role.
The '-ling' suffix is how English made something sound cute and young—a duckling is a young duck, so a forestarling was a young lookout, probably a kid learning the job.
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