Based on previous discussions, I don't think so. If they're really for knitting gloves you'd expect to find a lot of standard 'adult hand' sized dodecahedrons along with a few large & small (if that), but in fact you find a whole range of sizes (from tiny to gigantic), with far fewer mediums than you'd expect. They don't cluster around commercial towns: were people really knitting most gloves in border forts? They'd have been very expensive and difficult to produce; it wouldn't make sense for a master metalworker to spend weeks working on a trinket for knitting gloves when it could just as easily be made from wood for a fraction of the cost & effort. IIRC, they don't all have the knobs & holes, or they're oddly sized, and generally they're pretty nonstandard. You find them included in wealthy burials: were these rich people really knitting their own gloves--along with soldiers on the front lines? Why would they be buried with a knitting tool specifically for gloves?

Altogether, it seems pretty unlikely they were an aid to knitting gloves.