Shrillex summed it up. AFAIK, the only time that item effects from two different items do not stack is if they're extremely similar (i.e. Manamune+Archangel's Staff, or Trinity Force+Sheen). Frozen Heart and Randuin's Omen are completely different so there's no reason why they shouldn't stack.





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The effect and it way it enter in action on each items is formulated differently, so I wounder if it is consider the same ability in regards of the Unique Passif stacking possibility.
Frozen Heart
99 Armor, 500 Mana. UNIQUE Passive: Reduces ability cooldowns by 25% and reduces the attack speed of nearby enemies by 20%.
Randuin's Omen
90 Armor, 300 Health, 25 Health Per 5 Sec. UNIQUE Passive: 15% Cooldown Reduction and 20% chance on being hit to slow the attacker's movement and attack speeds by 25% for 3 seconds. UNIQUE Active: Slows movement speeds and attack speeds of surrounding units by 35% for 2 seconds + 0.5 seconds for each 100 Armor and Magic Resist. 60 second cooldown.