I am by no means a scientist, but my question is, ethics aside, is the premise of the movie correct, could we clone dinosaurs?

Short answer, nope.

Only very limited, as in dozens of markers of what is a very long strain of billions of markers can be found in fossil remains. It's a bit like having 3 pieces of a thousand piece jigsaw puzzle. Those 3 pieces certainly give some accurate information, but nowhere near the amount required for something like genetic engineering.

The way the films dealt with this was using a fictional and unrealistic suggestion of using a frog's DNA to substitute all the missing parts.

Doing that in reality would propose engineering entirely new species based largely on frogs. The results would've most closely resembled new types of frogs, perhaps feathered frogs and frogs with scales.

But what is most likely to happen is you'd just make some organic sludge that never survived the test tube.