Lizardfolk are typically seen as primitive humanoids with minimal intellect and a brutal, highly territorial culture. Though that is true in many villages, lizardfolk honor intuition and wisdom in a way most civilized cultures cannot understand. Lizardfolk adventurers are rare. Those who are banished for real or perceived crimes may turn to mercenary or adventuring life in order to survive.
On some worlds in the Material Plane, groups of lizardfolk have split from their primitive ancestry and developed into more civilized cultures.
Though not fully aquatic, lizardfolk make a great PC race for island and coastal campaigns, and for those who want to explore submerged destinations without sacrificing utility on land.