Sounds like you might be describing Pinstripe motley (if all or most of the dots are connected into a stripe) or Q-tip motley if groups of two dots are connected (making a Q-tip shape). If you have a picture as an example, that would help.
Classic/standard motley - this is the connected saddles down the back forming circles/dots. Level of expression does have a selective breeding quality to it
Hurricane motley - this is a classic motley with frosting in the saddles causing the color to ‘concentrate’ around the dots, forming a ring
Q-tip motley - this is where some of the circles in the classic motley start stretching and connecting with one another, 2 to 4 spots at a time
Pinstripe motley - most or all of the circles are connected, leaving a narrow line down the spine instead of the typical circles
Banded motley - instead of forming circles at all, the saddles stretch downwards to connect to the belly
Leopard motley - rarest pattern, looks like what would happen if you tried to have a pinstripe and a banded motley on the same animal. The pattern is relegated to large blotches on the side with no pattern over the spine
I think that this used to be more available. I seemed to see more of them, say ten years ago. It seems like it’s something which could be selectively bred, just as the hurricane pattern can be selectively bred. I have seen the term “polka dot motley” used for individuals with this pattern.