Many people call an alligator 'crocodile', but then any American will say, "No, it's an 'alligator', but we do also have crocs here."
What does the OLB say about why that animal is called the way it is:
tha aldergrātesta ādiska sind algaettar hźten, thrvchdam se yvin grūsich bitte an thet rotte kwik, that mith-a strāma fon boppa nźi tha delta dryweth
De allergrootste eidechsen zijn de 'algaettar' geheten, doordat zij even gretig bijten aan het rotte 'kwik' (???) dat met-de stroom van boven naa de delta drijft
the largest are called alligators, because they eat as greedily the putrid cattle that float down the stream
So, following the OLB, "algaettar" has something to do with 'greedily eating... rotten meat'. What do they mean, 'alga-eattar'?? 'Eattar' = eaters?
It is generally known 'gharials' only eat living fish, btw.