I initially believed the reason is purely technical: since it seems to be in
ubuntu "multiverse" repository (implying non-free) it won't get included.
However, when looking at the copyright file of the frogatto package [1] I
don't understand why it's in multiverse. Perhaps they chuck stuff from
debian's contrib there?
[1]
http://changelogs.ubuntu.com/changelogs/pool/multiverse/f/frogatto/frogatto_1.1+dfsg-4ubuntu1/copyright
Looks like frogatto-data has a crazy non-commercial and no-derivatives
license conflicting the earlier license... [2] It's hard to understand what
the heck they actually mean. Why can't people just use standard licenses?
[2]
http://changelogs.ubuntu.com/changelogs/pool/multiverse/f/frogatto-data/frogatto-data_1.3.1+dfsg-1/copyright
So in the end I'm not sure at all how frogatto and frogatto-data are
licensed. Lovely!