Why did a picture of a frog get randomly downloaded onto my phone?

Ok so earlier today I noticed this candid shot of a frog jumping was somehow saved onto my phone, I had never seen this frog picture in my life, and then later in the day like just a little bit ago I went to check if it was still there and the thumbnail was still the frog picture but the actual photo changed to a sunset on the beach ??????? I have screenshots but I'm not sure how to show them here. How/why did this happen? I have a samsung galaxy s4

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