Synonyms for Chigger (same or very similar meaning)
WordNet sense 1 (small tropical flea; the fertile female burrows under the skin of the host including humans):
chigoe, chigoe flea, Tunga penetransWordNet sense 2 (larval mite that sucks the blood of vertebrates including human beings causing intense irritation):
jigger, redbug, harvest miteFrom the ODE community, based on WordNetadd/edit