Can a NMOS transistor be used as a Current Controlled Voltage Source?
The gate is isolated so by itself it cannot generate a voltage. An NMOS only has a causal relation from Vgs to Ids, not the reverse.

You can however connect gate to drain (NMOS diode) and inject a drain current. Then the NMOS will be insaturation (why ?) and the Vgs will be the value correspinding to the Id you injected

This principle is used in current mirrors.