I don't think that there is. For twitter, there's twitter audit but maybe someone has an idea if there's a telegram channel audit. But you don't fall for those fake members that are in a specific group.
You can have some idea if the channel is legitimately with real people or if it's just more of giving high number of members but most of them are fake. If mostly are fake, there's not that much conversation on it yet there are also many scammers in most of these crypto telegram channels.