Answer:
No. In the Elemental Hero series, Contact Fusion is reserved for Elemental Hero Neos and the Neo-Spacians. To fuse Elemental Hero Necroshade and Elemental Hero Wildheart, you must use the Spell Card Polymerization. This combination forms Elemental Hero Necroid Shaman.
Elemental Hero Necroid Shaman
DARK/Warrior/Fusion/Effect/Level 6
ATK: 1900
DEF: 1800
This monster cannot be Special Summoned except by Fusion Summon. When this card is Special Summoned, destroy 1 monster your opponent controls. Then select 1 monster from your opponent's Graveyard and Special Summon it to their side of the field.