ignoring the fact that "cold" isn't really a thing, because it's just the absence of heat—which hot flames produce a lot of—adjectives such as these are relative and require context in order to be meaningful

if you set a fire and relate its heat to the surface of the sun, then i suppose the fire could be considered cold in this context

likewise, ice cream could be considered warm if you relate it to the surface of pluto or something

but because human perception happens to provide the only practical and pertinent context for things like temperature, for all human intents and purposes, fire is hot and ice cream is cold