3 ms·It's a common idiom with an established meaning. The behaviour of actual frogs is immaterial.by fuzzix 13y agoIt's a common idiom with an established meaning. The behaviour of actual frogs is immaterial.nodata 13y agoIt's wrong: frogs don't do what was described.fuzzix 13y agoOstriches don't bury their heads in the sand when they sense danger.