I would like to provide your readers with a name and contact details of a super-helpful and trustworthy young man in Tamale, who is happy to help other travellers as well:
His name is Mohammed Kariyoko, email address: firstname.lastname@example.org, phone numbers: 0245 123 569 and 0208 320 440. He took me with his motorbike to Larabanga, when the metro mass bus did not come, because it had broken down and was in the workshop. Without Mohammed it would have taken me a full day to get to Larabanga. He even picked me up in the next morning and organised transport back to Tamale. Again, he is happy to organise transport in the region also via other means than motorbike.