It's possible if unlikely. Past "runner crocs" at least ancestrally had archosaur adaptations, including warm-blooded metabolisms and vertical limb postures, before developing their cursorial habits that happened multiple times separately. The intermediate stages between cold-blooded sprawling reptiles and warm-blooded active ones may have easily survived in the more experimental biota of the Triassic or the post-apocalyptic Paleocene with many empty niches, however, they would have a rough time surviving in an age of mammals and birds that are well-adapted and biodiverse, at smaller sizes and lower energetic requirements than dinosaurs.

Crocodilians are at least secondarily ectothermic compared to lizards, but they are decimated to semiaquatic niches only, so re-evolution of true runner crocs likely won't occur any time soon. The closest, the terrestrial-leaning Cuban crocodile is critically endangered. Saltwater crocodiles could become more like mekosuchians due to the still mostly marsupial mammals of Oceania leaving some openings, although domesticated animals, and invasive species might have changed that long-term.

Lizards don't have archosaur traits but they are at least diapsids and have greater numbers and biodiversity. Monitor lizards have the best chance of evolving to resemble the mammal-esque crocodile relatives of the past, due to a precedent of developing large sizes and active hunting styles. Monitor lizards also breathe unidirectionally like birds. Some tegus have developed seasonal endothermy. While iguanas have at least one example of a more aquatic lifestyle as an intermediary state to allow more crocodile-like traits. In all cases though, you're basically evolving archosaurs from scratch. (With salamanders, you're evolving reptiles from scratch.)