I found a Japanese font called Ikaho2 that includes these big top Latin letters and numbers.
I don't know whether they are an original design or based on an existing font. I looked at Big Top Acrobat, Comedy, Dreamland, Showcard Gothic, Laff Riot NF, Startling and a couple of other Fun Fonts, but they are different. Any ideas?
Big Top Sans Letters in Japanese Font Ikaho2