As above, it is not safe. It looks like the cord has been damaged by the freezer bring dragged over the power lead, a lot.
If the lead will still reach the socket, as above, cut the cord and fit a new plug.
The landlord is responsible for this.
Where a landlord provides an electrical appliance as part of a tenancy, the law expects the appliance will be maintained in a safe condition that will not cause harm to the tenant. Failure to do so could lead to the landlord being sued for negligence. However, the law is silent on how landlords should ensure they do this. As such, unless specifically required as part of a licence condition, portable appliance testing is always best practice for landlords but it is not a legal requirement.