whys it called "frogspawn"?

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Hello, so while sitting on the couch watching me do maintence my wife asked me why it was called frogspawn? Pulsing Xenia makes sence, and alot of others just are short of there real names, except that. So off to google and nothing popped up. A couple of sights of actual frog spawn in ponds but it didnt really look close to the frogspawn in her eyes. Curious if anyone knows? Thanks.