I have heard of palp x trig hybrids but I have never actualy seen one

A friend over seas is tinking with some hybrid croc projects

porosus x novaguinea
niloticus x porosus
niloticus x novaguinea
rhombifer x novaguinea
tomistoma x cataphractus

He has already been doing some hybrids like:
yacare x crocodilus
siamensis x porosus
siamensis x rhombifer
niloticus x rhonbifer
siamensis x rhombifer x porosus
and others .. he hasnt made a T-Rex yet though
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Great Lakes Zoological