No universal drainage arrangement should be assumed. The exact model determines which channels are present and which, if any, are owner-accessible.
What the observation tells you
A visible refrigerator drain is not permission to flush liquid toward a suspected freezer blockage. Another opening may be an air outlet or a service feature. Confusing these functions can damage the appliance or spread water into concealed areas.
A useful next step
Identify only the cleaning points described in the manual. Use their prescribed method and stop if the problem persists. Describe the water or ice location rather than asserting a shared drain is blocked.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.