For this movie I wasn't that compelled to see at first, but I might as well lay out what I can point out easily. Lyle, Lyle, Crocodile is a perfectly harmless tale taken from a classic book series; it's where a family moves toward a New York City apartment and when they least expect it, the son quickly finds a friend in Lyle, who's no ordinary croc--but one who can pull off a dead-on Shawn Mendes impression.
Lyle would be left at an attic in their care thanks to a quirky and struggling entertainer played by Javier Bardem, who aims to make a star out of the reptile, only though that Lyle suffers from a bit of stage fright. The theme of it really, is a family rediscovering their own joys and it can speak toward kids in a way, but that's where I felt it came down as--merely a children's movie. It even left me with questions in its live action setting, but you may have to suspend your disbelief for this one, particularly if you're a parent. I mean, there's a croc in the lead and the main antagonist is a comically mean and nosy neighbor whose name is literally Mr. Grumps.
So, for me it doesn't completely capture what other great family films gave, but it's also inoffensive with enough low stakes to best aim at that younger audience. B-