Breed? Guessing Blue Runner?

[Caseyluvschickens1]

MIL picked up

a few TSC ducks. What are they? Blue Runner??? One has a yellow bib the other doesn't. Sometimes they seem to walk upright, other times not....

If they are runner I'd they're any way to tell gender early (before voice)

 

[Lacy Duckwing]

Cute ducklings! Sorry, I don't know what they are, but keeping this post updated with recent pictures might help those who might!