A group of overlapping round avatars are called face piles, a face pile is a series of overlapping avatar images that come and go as users join and leave a given group.

import 'package:flutter_face_pile/flutter_face_pile.dart';

import 'package:flutter_face_pile/flutter_face_pile.dart';


FacePile(
    faces: [
        FaceHolder(
            id: '1',
            name: 'user 1',
            avatar: NetworkImage('https://i.pravatar.cc/300?img=1'),
          ),
          FaceHolder(
            id: '2',
            name: 'user 2',
            avatar: NetworkImage('https://i.pravatar.cc/300?img=2'),
          ),
          FaceHolder(
            id: '3',
            name: 'user 3',
            avatar: NetworkImage('https://i.pravatar.cc/300?img=3'),
          ),
    ],
    faceSize: 50,
    facePercentOverlap: .4,
    borderColor: Colors.white,
),