I have made up seven Rookie Digimon total, and the eighth Rookie will be one who is extremely underrated.

Group A
Squamamon is a Data attribute lizard-like Digimon. Attacks include Acid Flame and Gecko Strike.
Monmon is a Virus attribute primate like Digimon and the only Digimon out of the current eight to NOT be made up by me. Attacks include Swing Sling and Mischievous Hoop.
Bafuumon is a Neutral attribute cow-like Digimon. Attacks include Rampant Hooves and Cow Lick.
Robinmon is Vaccine attribute bird Digimon. Attacks include Tickle Blade and Feather Arrows.

Group Z

Karkerromon is a Shark-like Vaccine attribute Digimon. Attacks include Aqua Fang and Sneaky Slash.
Mirumon is a mongoose-like Neutral attribute Digimon. Attacks include Stun Knuckle and Sand Blades.
Zapmon is a mosquito-like Virus attribute Digimon. Attacks include Blitz Kiss and Shadow Needles.
Cholomon is a sloth-like Data attribute Digimon. Attacks include Barrel Roll and Noxious Yawn.