Is king of the swamp useable for a fusion sub for Vehicroid connection zone? I would really like to know a definate answer because if it doesnt then im going a totally different route with my roids.

Unfortunately no you can't use them for fusion subs.

Well, if they ever make a "Vehicroid" Fusion that does not say...

"A Fusion Summon of this card can only be conducted with the above Fusion Material Monsters"

...then yes, you could use Fusion Substitutes...but since the ONLY "Vehicroid" monster available says that...no you cannot use Fusion Substitutes...