Converting a mini-fridge into a freezer by placing ice around the inside walls is not a practical solution. While it may temporarily lower the temperature inside the fridge, it won't be able to maintain a consistently low enough temperature to keep food frozen.
Mini-fridges are designed to operate as refrigerators, which means they are optimized to maintain temperatures above freezing point. They typically lack the necessary insulation, temperature control mechanisms, and cooling capacity required to function as a freezer.
Placing ice around the walls of the mini-fridge will cool the interior temporarily, but the ice will eventually melt, causing the temperature to rise again. Even if you were to swap out the ice regularly, it would be challenging to maintain a stable freezing temperature, and the cooling effect would be insufficient to keep food frozen for extended periods.
If you require a freezer, it is advisable to invest in a dedicated freezer unit designed for that purpose. Freezers are built with the appropriate insulation and cooling systems to maintain a consistent low temperature and keep food frozen for extended periods.