Well one of my nicknames given to me by the girls I went out with at my school was frog (something to do with things I did with my tongue, apparently) so I have a big collection of frog items and my second tattoo is of a large green tree frog. The 51 bit comes from enjoying all the stories about Area51 when I was growing up, so when I set up my first website many years ago I thought I'd create a section with faked UFO pictures (I had just discovered photoshop) and Frog51 just made sense.