How are V speeds spoken?
It Depends on the speed, and in some cases the context it is being announced or discussed, different pilots may also call things out differently depending on op specs or simply the way they are trained.  

V1 is typically announced as "V One"

I typically announce V4 as "Trimming for XXX Knots" 

Vfe for me is typically "in the white arc, deploying flaps"

Vr is typically announced as just "rotate" 

Vx and Vy are usually discussed as such or some times as "pitch for best angle" or "pitch for best rate"



Some of the V speeds are never really announced but important to know. V speed numbers help define the operational envelope of an aircraft but are not always announced or even relevant to announce. For example unless you are in a really bad situation its unlikely you are ever going to announce Vne out loud but its a very important speed to know (and avoid).