can, if by some miracle, a diggerhorn and siren cross breed? as well as any of the unlicensed and official kinds?
siren/diggerhorn crosses are really popular within the exotic pet trade, plus a lot of modern anklebiters have at least one siren relative so their offspring look less like an anklebiter and are less likely to be confiscated by authorities. plus the traditional anklebiter coat pattern just isn't needed anymore, it was originally bred into basically every line because a lot of the AI CCTV detection software didn't recognize fauns with that pattern as fauns. nowadays though the AI is a lot better plus basically everyone knows what an anklebiter looks like, the only times you'd see a traditional anklebiter pattern is on brummys (makes them look more intimidating) or in working fauns bred specifically for film and TV to play anklebiters in action movies.
as for the unlicenced/official crosses:
"after the great lawsuit concluded that corporations couldn't patent an entire species, lobbying from companies like Nesle and PepsiCo still allows patents and copyrights on breeds of animals. many members of the internet forum for faunoculture on the social media site Reddit weren't happy with this, so together they started the 'OpenFaun project', a project to make fauns as close both genetically and phenotypically to the original two production breeds by DerCo IWP, the HeatherHorn and the 18 Swinelike. they began by cloning factory generation fauns from DNA sources found in DerCo IWP products and crossing the fauns produced with various unlicensed breeds, however this got members of the project in trouble with the International Criminal Court for cloning human DNA without proper permits. despite this the project produced two wildly popular breeds, the OpenHorn and the OpenSwine [as pictured below]"
in the wild inter-subspeceis crosses are extremely rare, but when it does happen it's normally a result of too small a siren population coexisting with other subspecies for reasons mentioned here.