What are some examples of omnivore dinosaurs?

Answer 1

Yes most of them eat meat and some eat plants
Most dinosaurs were either strictly carnivorous or herbivorous, however the following groups are possible omnivores:

primitive ornithischians (e.g. Heterodontosaurus tucki)

pachycephalosaurs

the sauropodomorph Panphagia protos

oviraptorosaurs

therizinosaurs

troodonts
There's some debate about this one but I think it is an omivore its Coelophysis.
We actually only know a few omnivorous dinosaurs. The only one I actually know is Oviraptor.

NEW PERSON EDITING:

Other then the Oviraptor, there is the Ornithomimus.
Only a few of the known dinosaurs were omnivores (eating both plants and animals). Some examples of omnivores are Ornithomimus and Oviraptor, which ate plants, eggs, insects, etc. Also, most herbivores are "accidental omnivores" in that when they are eating plants, they also ingest a lot of insects and small animals.
A dinosaur that eats meat and plants.
Heterodontosaurids, some prosauropods, and ornithomimids are probably all omnivorous, but the best candidates for dinosaur omnivory are troodonts and oviraptors. If you had to name one dinosaur that you knew for sure was omnivorous, it would be the basal therizinosaur Falcarius.

Answer 2

Yes, there were omnivorous dinosaurs. Some include Oviraptors and their relatives and Ornithomimus, and Troodon had a diet ranging from carnivorous to omnivorous.

Answer 3

Most bugs. Most birds. Some seaturtles