I wouldn't think so but I don't know for sure. A couple weeks ago my rooster age a whole adult field mouse in one gulp. You could always cut them in 1/2 if your worried about it. I was worried about my rooster for a day but nothing bad happened.
I was throwing out some dried up bread yesterday and one piece didn't break apart very easily. My cochin grabbed it and then she seemed to choke or cough several times. I tried to catch her as panic started to settle into my brain but then she coughed it up. I was so relieved. Maybe it is the way they swallow it ??