Mine like them frozen or thawed - they don't seem to care either way! When it's hot out, I'll throw a handful of frozen green beans in the wading pool in the back yard so they can bob for beans.
Usually frozen but I have had Max on a strict diet and he can be fussy so I simmered them for a few minutes in fat free chicken broth.
He is now down 8 lbs and what a difference in his energy level...now we just need to maintain that weight!
Can't feed frozen due to stomach problems, but I do buy fresh when I can and chop them very finely. If no fresh is around I go with canned no salt or frozen that are thawed and chopped.
Beansicles here also. We supplement Caera's dinner with frozen beans in an attempt to satisfy her hunger without adding calories. We really have to keep her weight in check, especially since her hip surgery. Misha doesn't like them any which way at all. Good thing she's at a good weight.
Bär likes his vegetables either fresh from the garden or sauted in butter. Spoiled I know, but when he looks at you with those big brown eyes.................