We called them horny roads as kids, not sure which species this one is though.
Sighted at Cottonwood Springs, Joshua Tree National Park
Sighted at CottonWood Visitor Center - Joshua Tree National Park
Sighted on the Botanic Trail at the Cottonwood Visitors Center of Joshua Tree National Monument
sighted at Ash Meadows NWR - and so I think it is a Nevada Side-Blotched Lizard