Franklin Templeton, a heavyweight in traditional stock- and bond-fund management, said it would buy a spinoff from the venture firm CoinFund to expand its cryptocurrency-investing offering. Franklin, known for marketing mutual funds for individual investors, made an early entry into crypto in 2018 and has assembled a digital-assets team of more than 50 people. 250 Digital, whose spinoff from CoinFund was announced in January, is led by the former CoinFund executives Christopher Perkins and Seth Ginns.