Yes there are! Practically in every major city[0]. Moreover, they are threatened with up to 20 years of prison, so this has much more value than armchair criticism. Many of them are young people, risking all their youth[1].

[0] eg: https://www.rferl.org/a/yekaterinburg-protest-russia-invasio...

[1] Look at this girl arrested on the first photo, looks like a middle school student: https://www.e1.ru/text/gorod/2022/02/25/70468868/