I can help with a few...

Love frogs...got 9 grey treefrogs and 1 spring peeper

1) It is a bullfrog tadpole and just leave him be...he is hibernating and will mature when it gets warm enough...he comes up for air just not so often as he would in summer...frogs are masters of metabolic rate adjustment...and they don eat a lot ever.
2) Frogs can mostly hear water ie that is to say the croaking of a mate luring them to a wet breeding ground...little evidence suggests any other "sense".
3) Some sense of direction, yes, but greater variety and abundances of food are always found in a bigger ponds, bullfrogs need many big dragonflies a day and or other frogs.
4) Try some marigolds, low lying, fast flowering, butterfly attracting flowers...keep the menu lively and the customers will come back and stay longer.
5) snakes alive ... good luck there, more frogs = more snakes

ps I work at USGS so little to no mumbo jumbo here.

Bruce

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