Synonyms for Hopper (same or very similar meaning)
WordNet sense 1 (a machine used for picking hops):
hop-pickerWordNet sense 2 (terrestrial plant-eating insect with hind legs adapted for leaping):
grasshopperWordNet sense 3 ((baseball) a hit that travels along the ground):
grounder, groundballFrom the ODE community, based on WordNetadd/edit