Phoenix Logs/Flood Units/Pod Infectors

From Halopedia, the Halo wiki

Once the parasite can establish a hive it can begin to produce massive numbers of infection forms that spread out in search of new sentients to infect, and non-sapient animals on which to feed. Both ground and airborne infection forms are used as living weapons, hurling themselves at the enemy to overwhelm defenses and assimilate the unprepared.

Pods hurl themselves at infantry units, bursting and dealing damage. If Pods get the killing blow their victim becomes Infected and falls under Flood control. Though individually weak and easily killed, pod infectors strike in vast numbers and can move over cliffs.