Late Boomer: Jack in the Box Zombie, Gargantuar spawned very close to the house
Power Walker: Angry Newspaper Zombie, Pharoah Zombie without Sarcophagus
Pigeon Feeder: Pirate Captain Zombie, Magician Zombie
Zombie Pigeon: Zombie Parrot, but it doesn't steal plants
Dog Walker: Weasel Hoarder Zombie
Donut Roller: Barrel Roller Zombie, but without the Imps
Actor Zombie: Basic Zombie, then Battlez Gravestone for 10 seconds
Hot Dog Imp: Imp, Lane changing plants
Cell Phone Zombie: Sunday Edition Zombie, ZCorp Helpdesk
Taco Imp: PF-Imp
Plunger Zombie: Fisherman Zombie
Rocket Scientist: Prospector Zombie, Pterodactyl
Fog Machine Zombie: Bandit Zombie effects on other zombies
MC Zom-B: The titular zombie in PvZ2 + Brickhead
Pitchfork Zombie: Excavator Zombie
Outhouse Zombie: Boombox Zombie, Archmage Zombie, albeit only lane-affecting
Impfinity Clone: Multiple Imps
Zombot Drone: Zombie Parrot, but it doesn't steal plants
Zombot Drone Engineer: Pirate Captain Zombie, Magician Zombie
Skeleton Zombie: Basic Zombie, then grid item, then Basic Zombie again
Coffin Zombie: Brickhead Zombie
Gravedigger: Gravestone Grid Spawn and Necromancy event
Funeral Crasher: Brickhead Zombie, then three Imps
Shark Zombie: Snorkel Zombie
Sunbather Zombie: Ra Zombie
Flamingo Rider Zombie: Dodo Rider Zombie, T-rex
Hot Dog Vendor: Imp Cannon
Ketchup Carrier: Lost Doctor Zombie
Pizza Guy: Octo Zombie
Firewall Zombie: Shield Zombie
Robber Imp: Witch Zombie, Imp
Crossing Guard: Zombie King
Jackhammer Zombie: Pole-Vaulting Zombie
Rainbow Glitz: Zombot Multi-stage Masher 3000
Pop Star Zombie: ZomBotany Zombie + Starfruit
Keytar Zombie: Bass Zombie
Rainbow Bass Imp: Beatbox, Boombox, MC Zom-B
Spotlight Zombie: Disco-tron 3000
Immortica: Pirate Captain Zombie
ZomBlob: Multiple Carnie Imps
Bride of Frankentuar: ZomBotany Zombie + Lightning Reed
Ghost Zombie: A Basic Zombie in front of another Basic Zombie
Batty Vimpire: Chicken Wrangler, must die immediately after eating Garlics
Zom-Bats: Zombie Parrots, but it doesn't steal plants
Werewolf Zombie: Basic Zombie and Angry Newspaper Zombie back to back
Ballpark Frank: Dr. Zomboss
Goalie Zombie: Jester Zombie, ZCorp Consultant
Basketball Zombie: ZCorp Helpdesk
Slugger Zombie: Catapult Zombie
Vague ones on the iceberg
Brown Recluse: Ice Weasel
Earl Grey Matter: Steam Zombot
Nana Nitro: Zombot War Wagon
The Smash: One of those PvZ2C Gargantuars/bosses
Mega-Minions (Imp, Basic, Garg): Big Brainz variants
Anaerobics Instructor: Cardio Zombie
Autosaurus: Fire Breather Zombie, Robo Cone Zombie
Ballgown Zombie: Carnie Imp Twins
Bowler Hat: Gentleman Zombie
Butter Churner: Imp, BWB water to cancel puddles
Camotuar: Gargantuar, applies Bandit Zombie on 3x3
Cat Burglar: Lost Pilot Zombie, Zombie Parrot
Coop-Tron 3000: Chicken Wrangler
Deadlift Zombie: Breakdancer Zombie
Disguised: Bandit Zombie
Donutron: Cardio Zombie, Barrel Roller Zombie's barrels
Electrician: Hair Metal Gargantuar
Engineer: Evil Potions
Eyeclops Zombie: Turquoise Skull Zombie
Fowl Accident: Zombie Turkey
Fowl Egg: Sticky Bombed Turkey Wrangler
Frankentuar: Hair Metal Gargantuar, Jurassic Gargantuar
Handyman: ZCorp Helpdesk, but without speedup
High Tea Gargantuar: Steam Ages Gargantuar
Ice Scream Zombie: Zomboni, Hunter Zombie
Impfiltrator: Imp, applies Bandit Zombie on 3x3
Imposter: Carnie Imp, but splits only to the lane its in
Mad Hatter: Brickhead Zombie
Mustard Maven: Cardio Zombie
Paint Can Zombie: Prospector Zombie, Zomboni
Portal Technician: Portal Combat
Refrigerator Zombie: Chief Ice Wind Zombie
Safecracker Zombie: Dr. Zomboss missile, Sweet Potato
Shield Mech: Shield Zombie
Tea Kettle Zombie: Perfume Zombie, Bandit Zombie
Teapot Imp: Imp, Bandit Zombie
Trampoline Zombie: Swashbuckler Zombie, Lost Relic Zombie
Unicorn Gargantuar: Glitter Zombie, Gargantuar
Yoga Zombie: Prospector Zombie, Digger Zombie
Zombie Dog: Security Imp
Zombie Mascot: Three t-rexes
Wow that was long, but do you think PvZ3 had better zombies than in PvZ2?