We don't have synonyms for dropstones yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are dropstone, dripstones and dripstone.
(n) :
(glaciology) An isolated rock that is geologically distinct from the surroundings, indicating that it was carried from a distant area and then dropped in place (by a melting glacier); an erratic.
(n) :
(geology) An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along).
(n) :
(glaciology) An isolated rock that is geologically distinct from the surroundings, indicating that it was carried from a distant area and then dropped in place (by a melting glacier); an erratic.
(n) :
(geology) An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along).