Frank Slootman, CEO of Snowflake, on the day of its 2020 IPO, Sept. 16th, 2020.CNBCSnowflake said Wednesday that CEO Frank Slootman, 65, is retiring, and will be replaced by former Google ad chief Sridhar Ramaswamy. The shares plunged 20% in extended trading.Ramaswamy, 57, spent 15 years at Google, most recently leading Ads and Commerce until 2018. He then left to co-found Neeva in 2019, a consumer search engine he hoped to rival Google until last year, when he announced he was shutting it down....