i don't think so. Jacob imprinted on Edward's and Bella's baby. if Jacob and Bella had a baby, it wouldn't be the same person. the physical appearance would be different. not to mention the whole personnality and character.
Ruthro.. they didnt have a baby!! she sed what if.. anyway i dnt think he would imprint on his own Daughter!! thats just disgusting.. lol..and i dnt think Bella and Jacob would even cum close to do that coz what if Jacob imprints on sum one else..and if he were wif bella and imprinted on her i dnt think u can imprint again,.
Truth is, it was just Renesmee that made him imprint. It was HER as in, if Bella and Edward had any other child, he would have not imprinted. So, if he had a child with Bella, it would NOT be the child he would imprint on.
I'm pretty sure that imprinting would have a built-in avoidance of incest.
Jacob didn't imprint on Nessie because she happened to be Bella's baby. He wouldn't imprint on any child she'd have. Nessie, his imprint, just happened to be Bella's child, and some Fans theorise that his initial attraction to Bella was caused Von the fact that she shared genes with his eventual imprint (same with Sam and Leah).
If Bella had a child with Jacob and never had Nessie, I don't think Jake would ever imprint. His imprintee would never exist.