I'm currently running Season of Ghosts for Adventures in Rokugan (5e).
Here are the conversions that I've made for the monsters for chapter 1 so far.
Using as sources:
https://www.enworld.org/threads/converting-pathfinder-2-monsters-to-5e.695477/
https://imgur.com/a/mTFma7j
Chapter 1 : To Light the Night
Giant Centipede
Speed 30ft, Climb 30ft
Initiative +6, darkvision
AC 12
HP 10
Skills : Acrobatics +5, Athletics +2, Stealth +6
Mandibles +5, Damage 1d4 Piercing Centipede Venom - DC 11 Con - 1d4 for 2 rounds
Saves Con +5 Dex +4 Wis +2
Viper Speed 20 ft, climb 20ft, swim 20ft
Initiative: +4 AC 12 HP 10
Skills : Perception +4
Fangs +6, 1d6-2 Piercing plus viper venom - DC 12 Con - 1d6-2 for 1 round
Saves Con +2 Dex +5 Wis +2
Giant Cockroach (random encounters)
Speed 25 ft, climb 25 ft, fly 15ft
Initiative: +4, darkvision, scent 60ft
AC 13
HP 24
Mandibles +5, 1d6+1 Piercing
Saves Con +5 Dex +7 Wis +2
Phantom Wolf
Speed: Fly 25 ft
Initiative: +6, darkvision
AC 13
HP 17
Immunities: disease, paralyze, poison, crits
Vulnerable to Kindness - DC 14
Jaws +6, 1d6
Spell Effects :
Daze : mental jolt, 1d6 mental damage, will negates
Fear : wisdom save or frightened 1 round
Walk the Line : 1 bonus action to become incorporeal
Saves Con +5 Dex +7 Wis +4
Jinkin Gremlins
Speed 30 ft Initiative: +6
AC 13
HP 21
Skills : Acrobatics +6, Crafting +4, (+6 traps), Deception +4, Survival +4, Stealth +5, Thieves Tools +6
Shortsword +6, Damage 1d6 Slashing
Sneak Attack : +1d6
Saves Con +4 Dex +6 Wis +4
Sparrow
Speed: 10 ft, fly 40 ft
Initiative: +4, low-light vision
AC 13
HP 9
Skills: Acrobatics +4, Thieves Tools +4
Beak +5, Damage 1d4
Saves Con +2 Dex +5 Wis +4
Weasel
Speed 25 ft
Initiative: +2, low-light vision, scent
AC 13
HP 9
Skills : Acrobatics +4 (+6 to escape), Athletics +2, Stealth +4
Jaws +5, 1d4+1 Piercing + grab
Constrict (when grabbing) 1d4 Piercing
Saves Con +3 Dex +5 Wis +2
Buso
Speed 25 ft
Initiative +7
AC 14
HP 58
Skills: Arcana +7, Athletics +8, Cooking +9, Farming +9, Survival +8
Javelin +6 throw 30 ft, Damage 1d6+4
Kukri +7, 1d6+4
Saves Con +7 Dex +4 Wis +5