This doesn't fit the noun requirement, but "smoking hot" came to mind for general informal use. It suggests an exceptional amount of heat.
In a more formal context, I'd go with "steaming hot" or "piping hot". If you want to imply that it was too hot to safely eat, "scalding hot" could work nicely.
"Ice-cold" does refer to a noun. The term is used a lot in reference to beverages that have been chilled by adding ice, or have been chilled nearly to the freezing point of water. Ice is probably the coldest thing we normally encounter.
On the other hand there are many levels of heat. "Hot" could refer to a shower, coffee, boiling water, a heating element that's started glowing, fire, and so on. Any of these could be encountered between waking up and eating breakfast, so there's not one that seems to stand out as an ideal reference point. It's more about what you can observe; something could be releasing steam, hot enough to burn your mouth, hot enough to emit smoke, or actually on fire.