Gnomish
dolm
noun. pit
dolmeg
noun. mole
dolfa
noun. mole
doldrin
noun. mole
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun appearing as G. {doldos >>} dolfa and {doldrin >>} dolmeg in the Gnomish Lexicon of the 1910s, derived from the early root ᴱ√NDOLO “delve” (GL/30). The form G. doldrin “mole” appeared undeleted in the Gnomish Grammar and the Official Name List for the Lost Tales (GG/8; PE13/104).
Neo-Sindarin: For purposes of Neo-Sindarin I would adapt these words as ᴺS. dolph, reconceived of as a derivative of the root ᴹ√NDOL “✱hill, head”, describing these creatures as hill-makers.