There was a story about a woman eating their neighbor's cat, but she wasn't a migrant, and not from Springfield.
There was a story about Haitian migrants snatching geese, but there's no evidence that they were eating them.
A lot of these things are half truths at best.
And plenty of people do weird things. There are a horrifying number of stories about white women doing things with their dogs. Its not meaningful or common enough to justify a presidential candidate talking about it.
And it's even horrifying if the candidate already doesn't care about how people are mistreated.