There are no such thing as a normal duck (please reword ur question and maybe I can help) :)
A Campbell is a mallard derivative so yes it can cross with a muscovy. All wild mallards and domestic mallard derivatives can cross with any Muscovy Duck. However the offspring will be sterile (except extremely rare cases). Muscovy drake on mallard hen generates mullards which are fast-growing birds bred for meat. There are large industrial concerns that do this.
a cross between a labrador and a poodle is called a labradoodle
A cross between an alpaca and a llama is not always called a huarizo or dozer. A cross between an alpaca and a llama can sometimes be called a llapaca.
Synaesthesia.
It is called that because its a cross between freestyle and racing. It is a downhill race that involves jumps, therefor making it snowboard cross
This is called a dihybrid cross in which both parents are heterogeneous.
a hybrid walleye is called a saugeye. it is a cross between a walleye and a sauger. it can be produced in a hatchery or occasionally occur naturally where walleye and sauger inhabit the same waters
They are usually called Collie cross Greyhound Lurchers.
Cross Pressured
chimera
The synapse
An impossibility.