We don't have synonyms for dragrope yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are drag-rope, drag rope and agrope.
(n) :
Alternative form of drag rope (“rope carried in a hot air balloon”). [A long, heavy rope carried in the basket of a hot-air balloon and permitted to hang over the side and drag on the ground in order to lighten the basket.]
(n) :
Alternative form of drag rope (“rope carried in a hot air balloon”). [A long, heavy rope carried in the basket of a hot-air balloon and permitted to hang over the side and drag on the ground in order to lighten the basket.]