I don't have shortening and was wondering what pork fat would do to the texture of my crusty rolls? Can pork or bacon fat be used to replace shortening in rolls?
Yes, animal fats such as lard or rendered bacon fat may be substituted for shortening. Really, shortening is a substitute for animal fats in the first place!
Lard and bacon fat do have a lower melting temperature than shortening, but for a kneaded dough, rather than a pastry dough, which is what I'm assuming you mean when you say "rolls," this difference is immaterial.