They are pretty boring, they are one of the many monsters that are in the free DM's Basic pdf on the WoTC site.
Lizardfolk
Medium humanoid (lizardfolk, neutral)
Armor Class 15 (natural armor, shield)
Hit Points 22 (4d8 + 4)
Speed 30 ft., swim 30 ft.
STR DEX CON INT WIS CHA
15 (+2) 10 (+0) 13 (+1) 7 (−2) 12 (+1) 7 (−2)
Skills Perception +3, Stealth +4, Survival +5
Senses passive Perception 13 Languages Draconic Challenge 1/2 (100 XP)
Hold Breath. The lizardfolk can hold its breath for 15 minutes.
Actions
Multiattack. The lizardfolk makes two melee attacks, each one with a different weapon.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target.
Hit: 5 (1d6 + 2) piercing damage.
Heavy Club. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) bludgeoning
damage.
Javelin. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 30/120 ft., one target.
Hit: 5 (1d6 + 2) piercing damage.
Spiked Shield. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing
damage.
Lizardfolk are primitive reptilian humanoids that lurk in swamps and jungles. Fiercely territorial,
they kill when it is expedient and do whatever it takes to survive.
So a bunch of attacks that are all the same +4 to hit and 1d6+2 damage, and they can hold their breath, same old school type monster that is just a sack of hit points. I would love to see a racial ability like a gnashing bite that grabs you, or a tail slap that trips, maybe different types of lizard folk that spit venom, or have chameleon skin.