Its name is 板栗小队 (Chestnut Squad). It creates small chesnuts to defeat zombies. At the first time I didn't know that the small chestnuts can't swim. All I have to do is place a lilypad in front of it.
Download links for version 1.4.5: - Original apk file: https://drive.google.com/file/d/0B72zZ-c_XAc2SWN0QkhrRFRUWGs/view?usp=sharing - Modded apk file (free shopping only): https://drive.google.com/file/d/0B72zZ-c_XAc2TktZUHNrZ3hpYXc/view?usp=sharing