When using a convoke card to tap a creature towards its mana cost will it target that creature. More importantly will tapping a creature for mana cost will it trigger heroic since your still casting the card.
No.
It's similar to how {Springleaf Drum} works.
No to the second part as well, unless you're tapping a creature with heroic to convoke a spell that targets that creature. Tapping it for convoke doesn't trigger heroic; you're essentially just paying an alternate cost.
Example?
{Chord of Calling}
702.50a (http://imtgapp.com/forum/index.php?action=imtg;area=rule;number=702.50a): Convoke is a static ability that functions while the spell with convoke is on the stack. "Convoke" means "For each colored mana in this spell's total cost, you may tap an untapped creature of that color you control rather than pay that mana. For each generic mana in this spell's total cost, you may tap an untapped creature you control rather than pay that mana." The convoke ability isn't an additional or alternative cost and applies only after the total cost of the spell with convoke is determined.
Example: Heartless Summoning says, in part, "Creature spells you cast cost {2} less to cast. You control Heartless Summoning and cast Siege Wurm, a spell with convoke that costs {5}{G}{G}. The total cost to cast Siege Wurm is {3}{G}{G}. After activating mana abilities, you pay that total cost. You may tap up to two green creatures and up to three creatures of any color to pay that cost, and the remainder is paid with mana.