I don't know about Ahamdis or Qadians in Somalia, because I've never seen it with my own eyes, but my aunt who went to Somalia a year or so ago says there are. My other Aunt (my mum's cousin, lived most of her life in Xamar) says she doesn't know about Ahmadis and Qadians, but she says in Xamar there some who are definitely different from the Sunnis. She says they have their own masjid and won't accept your Salaam. I asked how they came to be what they are she says, often the poor parents would send their kids to these free dugis that offered to keep them long hours and feed them, clothed them and took care of them. And after that it is history they have been brainwashed.
Waxaa loo yaqaanaa takfiiri in Somalia. They have their own butcher shops, their owns mosques, schools and everything. Somalis take them lightly for some reason and don't see them much of a problem. I am sure there are members of these groups on Somalinet.