mixedbreed

As a verb crossbreed is

to produce (an organism) by the mating]] of individuals of different breeds, [[variety|varieties, or species; hybridize.

As a noun crossbreed is

an organism produced by mating]] of individuals of different [[variety|varieties or breeds.

Mixedbreed is likely misspelled.

Mixedbreed has no English definition.

As a noun hybrid is

offspring resulting from cross-breeding different entities, e.g. two different species or two purebred parent strains.

As an adjective hybrid is

consisting of diverse 'hybridized' components.