"Chicken walker" - the term - is totally a thing. Not only is there a TV Tropes page about them, there's a Wikipedia page too. So no ragging on your players if that's what they choose to call them, despite your insistence on calling them "bipedal battle mechs" or whatever.

Transcript

{Ewocs fighting troopers}
[SFX]: Pow! {a chicken walker fires}
[SFX]: Pow!
[SFX]: Kaboom!
[SFX]: Pow!
C-3PO: Chickens? Where are the camel meeples?
[SFX]: Pow!
GM: These can fit between the trees better.
[SFX]: Wrestle!
[SFX]: Kaboom!
[SFX]: Thud!
Clone Trooper: Aaargh!
[SFX]: Thud!
[SFX]: Kaboom!
[SFX]: Pow!
[SFX]: Pow!
C-3PO: Are you having fun with all those miniatures?
GM: Yes. Yes, I am.