There are search engine(s) specialized for TOR. As per Wikipedia[1]: 'Ahmia is a clearnet search engine for Tor's hidden services'. It was part of Google summer of code in 2014[2].
Cool, been looking for something like this. However, it should be noted that this is not what parent asked about. Parent was wondering if Google was usable for regular web searches using a client that came from a Tor exit node via the Tor network.