Chuckies

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This is a nick-name given to the flesh-eaters. It seems most people outside of Rule use the term Chuckies.
Ashes
Alex and Ellie see a group of changed eating the adults at their camp. Later they see Tom's friend who has changed. Alex see's a large number of change's foot prints when she travels by a highway. At the end of Ashes Alex finds out that Rule has been feeding the Changed when she see's a pack of changed at a feeding ground. 
Shadows
Alex is taken captive by a group of changed who wear wolf skins. Her captors later change to a group of changed who wear snow white outfits that resemble ninja's with white balaclavas. She is then taken to the Yeager mines where hundreds if not more changed use as a home base.
Tom kills two changed after thinking they killed Alex. He later helps Mellie and Weller collapse the mines which in turns breaks the Change's circuit for rule. He see's a group of seven changed coming up the hill at the end of the novel where they drive him, Weller, and Ryan off after he finds Alex.
Monsters
Tom fights and kills a zombie/berserker changed at the ruins of the Yeager mine. 
Alex travels with Wolf and his gang. They later (briefly) fight another group of changed at the lake house after Wolf, Marley, and Ernie steal their food. Those changed are soon killed by Finn and his changed.