Can a painted turtle eat lettuce.?

i found it in my pond. half of his face had the flesh clean out of it. in the pond he wasn't doing well, he was swimming differently and didn't hear well. im hoping he gets better. but im not sure he can escape from predators if one day i release him. i put him in a huge plastic pond with some places to... show more i found it in my pond. half of his face had the flesh clean out of it. in the pond he wasn't doing well, he was swimming differently and didn't hear well. im hoping he gets better. but im not sure he can escape from predators if one day i release him. i put him in a huge plastic pond with some places to bask. i wonder if i through lettuce in his tank will he eat it?and any additional advice?
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