That is what anode rods do: they corrode to keep the rest of the tank from doing the same.
You are probably ok, flush the tank a few times and replace the plug with a proper plug.
What kind of smelly? A sulfur type of smelly? We've found that the water heater will start to smell based on the water that is put through it (e.g. if a campground is using well water vs a city water system). Typically if its a sulfur smell a good flushing will get that out.
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