I don't think there is a term for your glass' finish. It's not fused, which is when pieces of glass are laid out in a pattern, possibly on top of a large piece of glass and then melted together.
The effect on your vase is created by rolling a hot blob of (often clear) glass in coloured glass powder sprinkled on a metal table. The vase is then blown to shape after reheating and the powder melts and spreads into blobs.
Spatter is created in the same way using several colours but the term derives from paint spatter (or something similar) and is probably a modern way of describing an old technique.