There is no such thing as normal lungfish name, lol! You must be talking about about the west african lungfish (Protopterus annectens annectens) as they are the most widely available in the hobby. Spotted african lungfish (Protopterus doloi) is a completely different african lungfish species. Please read the stickies to understand more. There are 4 different kinds of african lungfish species.
The one that you have is the West African Lungfish (Protopterus annectens annectens). Growth rate on those is fast if cared properly. They are by far one of the fastest grower.