hog-louse
/ˈhɒɡlaʊs/noun
1A woodlouse. Compare sow-bug. Now historical.
2Any of various aquatic isopods and other crustaceans; especially (more fully water hog-louse) a water slater (genus Asellus).
3Chiefly US. The pig louse, Haematopinus suis.
Origin
Late 16th century. From hog + louse.