I am indebted to Sach for pointing out the generic term "ice pick weight", as this has highlighted an omission in my comments.
I forgot to mention the American equivalent of "frit and bubble" designs which do indeed go by the general name "ice pick bubble weights" [using full terminolgy from Jean S. Melvin's book American Glass Paperweights and Their Makers (first edition produced 1967) ]. That term also applies to the bubbles in the (American) "trumpet flower" designs. I believe that the term is essentially an American one.
As an extra point of interest, the tool used to produce the bubbles in these type of weights has varied across makers. Some used a single tool, with each bubble formed individually. Some made up a multiple point tool to produce several bubbles at once. I have seen an old six point tool found in the ruins of the European Josephinenhutte factory, the tool simply being formed as a circular section of wood with six "nails" at the relevant points.
Another point of interest is that Paul H Dunlop, in his generally excellent book, The Dictionary of Glass Paperweights - an illustrated primer makes no mention of "ice pick" as a term for any type of weight.