No, as in there isn't an SFB variant for an E4 scout.
There also isn't a Tholian Destroyer scout (it goes PC scout, War Cruiser scout, then the DD PF tender and the war cruiser PF tender).
The Federation did a light survey cruiser based on the Texas class, and because it can be used as a carrier as well it'll be in my next update to the fighters files.
I've just been going through the variants of everything destroyer or smaller on hulls in the first rulebook, for an idea I've had, and was surprised that there was never a scout version of the E4.