There are a couple that 'mimic' that I know of. Hydrodynastes Gigas or the false water cobra, is a large rear-fanged snake that can hood. One of my favorites that I am still trying to track down is Malpolon Moilensis also known as the egyptian false cobra, I have seen it under 2 other scientific names so I am not sure what is currently accepted. There is also the Chinese false cobra Pseudoxenodon Macrops, but I believe they eat frogs and care in captivity is difficult, if you could ever find one. You should know they are all opisthoglyphous.