Not practical to fix. Next time use a hair dryer and patience to
defrost.

A couple things worth mentioning:

When using a hair dryer don't try to melt the ice over a broad expanse.
Instead concentrate on melting your way through to the metal in one area.
Metal is a far better conductor of heat than the ice is so once you expose
a little of the evaporator you keep applying heat there (don't get crazy
and damage it though) and the warming evaporator will melt the connection
holding the ice in place and it will detach in large pieces. You get done
faster and minimize the chance of food starting to melt.

I presume everyone knows this but in case they dont, there's no such thing
as a truly frost free freezer. Ice still builds up on the evaporator coils
but they are hidden from view so you don't see it. Once a day (hopefully
at night) the refrigeration is shut down and a heating element melts the
ice. Because defrosting is done more often than people generally defrost
manual fridges the buildup is not as great. The water drains to a pan
under the fridge where warm air from the condenser coil will evaporate it.