Crockford gave a definition

Not true. He just uses the term.

In contrast see ...

So?
I thought we've been there already. First-class functions alone do not make a lambda language.

Perl is a multi-paradigm language

And who ever disputed that?.

All of this is not really such an interesting issue.

If it makes you feel better freel free to call JS, Perl and whatnot "lambda languages".

It's a bit like Humpty Dumpty ("When I use a word it means just what I choose it to mean") so if you want to use the term "lambda langage" meaning just "a language with first-class functions" you can of course.

However I contend that the term is usually used as a synonym for "functional progamming language" and"having first-class functions" and "being a functional language" are not the same thing (the former being nessecary but not sufficient for the latter).