Why not? Most likely the person writing up that bit in the PF Bestiary had an idea he liked, but didn't search the rest of the Bestiary for mentions of the word 'lion'. Can they interbreed? Quite likely given the wide range of creatures manticores can interbreed with - they seem almost like PF humans - but it's certainly up to the GM.
There's hardcore, and then there's grifficore.
Crossbreading manticore with other magical beasts seems to produse an offspring that is mainly of that other race, but has manticore tail. So a griffon with manticore tail seems natural.
Other possibility may be a manticore with griffon's feathery wings, and its flight speed/maneuverability.
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There's hardcore, and then there's grifficore.
Or a mantifon? Perhaps it's like a liger/tion thing, and a male griffon and a female manticore produce grifficores, and a male manticore and a female griffon produce a mantifon?
(I pity the manticore that tries to mate with a sphinx, since it seems more likely he'd get his butt kicked up and down the skyways...)
Maybe a Cryospinx and a female Manticore.
Aerial combat