No, it is not. It is the past tense and past participle of the verb (to plod).
The future tense is will plod.
No, it is not a preposition. The word plodded is a past tense verb, and may be used as an adjective.
prodded
not a fast but slow
slowly walked :)
Yes, "plodded" is the past tense form of the verb "plod," which means to walk slowly and heavily, often with a lack of enthusiasm or energy.
the word means to walk or work in a slow way because of tiredness.
walked walked heavily
Plod; tread.
The phrase "they plodded along on leaden feet" is a metaphor. It compares the heaviness of their steps to the weight of lead, suggesting a slow and laborious movement.
After a long day at work she plodded up the stairs to her bed.
It's what a horse does when it wanders. OFr example when a human wanders we too plod. It's a lazy, thoughtless form of "walking"