Google maps allow you to “avoid” toll roads. Google maps indicates that your route includes a toll road or partial toll road. Google maps do not show toll roads as a layer or toll locations or toll amounts as markers.
Google maps does not show tolls. However, it indicates presence of toll roads in turn-by-turn direction. You can use Tollguru™ Toll Calculator to see tolls on Google maps for all the logical routes between your origin and destination.