Hi Nancy,
It's not unusual for developers just to want a functional specification to build from, that's what they need. BUT wireframes are functional specifications most of the time (if highly detailed). Prototypes are useful for all kinds of things but if you throwing stuff over the wall they're a supporting output not the core out put.
A word document with annotated diagrams explaining what happens if button A is pressed is essentially the same thing as a fully annotated wireframe but displayed differently.
