If you just want anonymous polling or surveying among predetermined options, then there are dozens of online audience response tools to choose from (although they are not as fun as dropping tokens in Feedback Frames).
If you want the real superpower of Feedback Frames, which allows participants to generate their own statements, then immediately rate them, and see instant results,  then there are only a few equivalent online tools to consider:
GroupMap.com
ThoughtExchange.com
PowerNoodle.com
Stormz.me
Xleap.net
GetVetter.com
Consider.it
Of course, to provide equal opportunity to use any of these apps in a meeting, all participants need a charged compatible device they are familiar with, a good wifi or data connection, along with technical instruction and support.