Yes, respawn of 1 more snake.

First battle: just 4 snakes, no respawns.
Second battle: 8 snakes, no respawns.
Third battle: 12 snakes, inclusive 4 respawns.
Fourth battle: 16 snakes, inclusive 8 respawns.
Final battle: 1 Bi-heads snake (boss) and 12 snakes, inclusive 6 respawns.