On 17th August 1865, a freak rainstorm covered about 3 acres of Maxwelltown, Dumfries in froglets. A fortnight before, the tracks at Lanark Railway Station were covered in tadpoles after 5 minutes of rain.
References
Greenock Advertiser. 22nd Aug 1865. pg.2
The Scotsman. 24th Aug 1865. pg.4