No, they are birds.
-Nope they are not mammals that's not what mammal means. Mammals are their own class of animals, just like reptiles, birds, fish, etc.... Toucans are in class aves (birds) not mammalia (mammals)
Mammals include vertebrate animals which are both warm blooded and produce milk from modified sweat glands (teats) to nurse their young, and almost all mammals have live (viviparous) young. So there's a very big difference between birds (including toucans) and mammals.
As far as diet goes:
A carnivore eats other animals, so does an omnivore (omnivores eat both plant and animals matter).
ANSWER TWO:
Toucans are not mammals, they're birds. A mammal is a thing that has nipples and provides milk for their babies. We are mammals; so are dogs, cats, horses, etc., and believe it or not, a bat is a mammal- their nipples are on their armpits. I know, disgusting, right? Anyway, toucans are birds, they lay eggs and their offspring don't need milk.
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In a sense no. They are primarily fruit eating but can be omnivorous and will eat insects and small lizards. Captive toucans have been seen to hunt insect actively and it is possible for toucans to eat only insect. They also plunder eggs from nest along with nestlings. These provide protein. However, in their natural habitat, they are frugivorous (fruit eaters) as it plays an important role as inhabitants for seed dispersal units.
None of the above. Toucans are avians. However, it is said these branched off from reptiles at some point.