It is most likely a hadrosaur.
Hadrosaur is disputable.
The idea that Krokodilopardalis is a dinosaur is one that is based on the word of mouth support of people looking for living dinosaurs in ancient art. It is a fallacy to tackle so many fields at once, art, zoology, ancient Greek, etc.
First, the mosaic shows a number of animals which are common and not hard to find in Africa even in 2016. Our approach should be to line up those animals, reptiles if you want, and see if any common animal fits the description. Crocodile is not correct because a true and undeniable crocodile is shown elsewhere.
This brought me to the Nile monitor lizard. 'Pardalis' in this case, would mean 'spotted' and this monitor is. It can also be found in the Nile River which establishes that it was known about.
Additionally, the partner Krokodiloxersaioi might have some relation to Krokodilopardalis. Monitor lizards do come in varieties. 'xersaioi' translates to 'on shore', which contrasts well with the Nile monitor which likes water. Savannah monitor is a guess, but a good one. It could be one of the other species of monitors but having a number of options in the area of monitors adds believability. Therefore, 'krokodilo' should be extended to monitors. If you have trouble making this extension, consider the number of animals which are misnamed or misclassified in history. Whales as fish, dragons that are lizards, seahorses, the platypus, pandas as raccoons but now bears.