I don't think Snape called Remus "Wolf" in canon either. I probably didn't word my post very well. My beta didn't say that's what Severus called Remus in canon, she said 'fanon'. That's why I wanted to know what the Snupin writers usually used when they wrote. I don't know how much Snupin my beta usually reads, but I think she reads more Remus/Sirius and the writers in those stories may have Severus addressing Remus in a different way. Since I don't really read Puppy-Shipper stories I couldn't say.