I wanted to know if you can use social interactions during combat? e.g. Can you frighten(status) someone by using intimidation?
You can use social interactions during combat. What effect this has is up to the DM.
I have seen social interaction grant advantage to an ally (like the Help action), disadvantage to an enemy (like the opposite of the Help action - Hinder?), cause enemies to hesitate (delaying or passing their action), or flee - this was the decision of the DM based on the success of the ability check (which is usually charisma (+ deception, intimidation, or persuasion proficiency), but could conceivably be intelligence or wisdom too depending on circumstance) and the situation. In some cases, the DM decided to make it a contested roll between the player and the monster/npc.
Usually, this consumes the player's Action on their turn. Occasionally, it has been allowed without an Action but usually with a lesser effect (or a higher difficulty).
I have almost never seen a DM refuse to allow a player to attempt to intimidate, talk down, scare, or otherwise socially interact with npcs/monsters during combat. While there is no listed action for doing so (outside of a few specific class abilities/spells), it seems to be nearly universally expected to be a normal thing that should be allowed to at least try to do.