Specific heat of foods is used to calculate the heat that must be removed during initial cooling. It can be estimated with Siebel's formula:  cp= 0.00800*a + 0.200, where “a” is the percent water content of the food. This formula is for cooling only and does not account for the heat removed during freezing. I looked up water content of kiwifruit on the web and found a paper listing the water content of Hayward variety equal to 85%.  Using this number in the formula, kiwifruit has a specific heat of 0.88 Btu/pound-°F.  To get specific heat in SI units (kJ/kg-°C) multiply this number by 4.19. –