What Clouds Are Called Thunderheads?

What Clouds Are Called Thunderheads? What clouds are called thunderheads? When occurring as a thunderstorm these clouds may be referred to as thunderheads. Cumulonimbus can form alone, in clusters, or along squall lines. These clouds are capable of producing lightning and other dangerous severe weather, such as tornadoes, hazardous winds, and large hailstones. What kind