you can always try the many ponds in plymouth at the miles standish reserve. Aside from that there is a booklet you can get from the DCR or whatever the govt. acronym is for parks and recreation. the booklet has a summary of fish species and ponds that are accessible to fish on. i'll look up info when i get the chance.
for pickerel there are a couple bog ponds in pembroke that are full of them and there big 20"+, for trout I would check out plymouth, I heard there's a reservoir in Bridgewater that stocks tiger muskie