Yes, plod is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
plod
Verb
1. Walk heavily and firmly, as when weary, or through mud
Noun
1. The act of walking with a slow heavy gait
What Scrabble words can I make with the letters in plod?
3 Letter Words
2 Letter Words