There are many Dwarfs that grow to around 10".
Most of them are sub tropical, needing water temps of 19c and lower.
If you mean mixing Snakehead breed A with Snakehead Breed B, then no.
Channa should be kept in species only tanks.
If you mean can you mix a whole load of the same breed of Snakehead, then the answer is yes for a while until a pair forms. At that point the pair will destroy all other fish in the tank.