Is there a move topological brush in Blender? I can't find a way to change falloff to use the distance on the topology rather than the absolute distance. 
It is very difficult to sculpt things like fingers. When I grab one finger it automatically moves the others.
zBrush does have this brush, but I'd really prefer to stay in blender.

Is there some option/addon/workaround to this?
There is not counter part to topological falloff with the sculpt tools AFAIK. There is a topological option in the move, scale, rotate tools when you enable Proportional Editing called Connected Only. 

If you need to use the sculpt tools, use masking or hide parts of the mesh.