The American Foundation for the Blind's (AFB) VisionAware technology review by Steve Kelley presents information on Android's newest Select to Speak feature.
Like the Speech setting in iOS, Select to Speak enables a user to use Talkback to read a selected portion of text, without turning Talkback on and changing the other gestures, so it is very convenient for users who are not routinely screen reader users.
To find and change this setting you will need to go into Accessibility settings.