How to AND together two triggers in an automation?

Configuration
4

A trigger is a point-in-time event. There is no concept about having two triggers ANDed together.

Trigger off either sensor not changing for 2 hours, then check both in the conditions. Using template condition shorthand for brevity:

trigger:
  - platform: state
    entity_id:
      - sensor.freezer_temperature
      - sensor.refrigerator_temperature
    for: "02:00:00"
condition:
  - "{{ now()|as_timestamp - states['sensor.freezer_temperature']['last_updated']|as_timestamp >= 7200 }}"
  - "{{ now()|as_timestamp - states['sensor.refrigerator_temperature']['last_updated']|as_timestamp >= 7200 }}"
action:
YOUR ACTION HERE

The action will run when the second of the two sensors does not change for two hours.

You didn’t. See here. Three backticks (```) before and after the code.