A new study by Drumheller et al. (2016) found that crocodile bite marks on bones do not seem to differ between crocodiles young and old, or male and female, or long-snouted and short-snouted. They collected bones bitten by 21 species of modern crocodylians and studied the types of bite marks left on bones surfaces – whether they were pits, punctures, scores, or furrows, and whether these marks were bisected (with extra notches or scoring from serrated teeth) or hooked (marks that changed direction). They compared the types and shapes of these bite marks to the snout shape, size, sex, age, feeding behaviour (the famous ‘death roll’), and captive or wild status of each individual crocodylian that created them. They found no significant difference between the shape of the bite marks and the individual who made them – even for crocodylians of different ages, with different snout shapes, or different feeding behaviours!
So, it seems you might be able to identify a crown Crocodylian as the culprit of a bone bite-mark, but cannot predict its age, sex, snout shape, or which method it chose to dispatch of its prey.
Drumheller, Stephanie K., and Brochu, Chris A. 2016. Phylogenetic taphonomy: a statistical and phylogenetic approach for exploring taphonomic patterns in the fossil record using crocodylians. PALAIOS, 31: 463-478. [Paywalled]