This is a suboptimal forum for your question. Only Grindr can know what domains are being used by their apps and if these make use of DNS at all. Therefore you had to ask at Grindr.
Maybe adding grindr.com to your "always block" list does the trick already.
If not, look through the domains at https://dashboard.opendns.com/stats/all/topdomains 3 hours after you used these apps to possibly find related domains. Be aware, Grindr seems to use Amazon and Cloudflare CDNs, so the domain names or their aliases or PTR records may end with cloudflare.net or may contain (amazon)aws.
