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Atomic bombs make mushroom. It's well-known and we've seen many images of atomic experiments around the world. My question is, what causes the mushroom shape? Do conventional explosives like TNT and grenades also make mini-mushrooms? Is it a physical attribute of the explosion, or something specific to nuclear energy?

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It's due to the WP-Rayleigh–Taylor instability: it is an instability of an interface between two fluids of different densities, which occurs when the lighter fluid is pushing the heavier fluid.
Hot hair rises and colder goes down.
A Mushroom cloud formed by hot wet air:
enter image description here
Search for images or videos of 'Rayleigh–Taylor'.

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What does "WP" mean here? WikiPedia? –  Ruslan Jan 27 at 14:17
yes: I use: WP-wikipedia; PSE-Physics.StackExchange –  Helder Velez Jan 27 at 15:41

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