Please tell me that 98 on the hot side was a typo... that is way too hot. You want your hot side to sit between 88-92 degrees.
I have found that my BP's eat better when the cool side is above 80 degrees (I aim for 82)
at 101 grams you have a very young BP You can't tell for sure but I would guess that he is 3 months or less.
To transition to frozen I would start with live, then after a few successful feedings try offering a pre-killed rodent. after a few successful feedings on pre-killed give frozen a shot.
switching over to rats will help in the long run but doesn't have any real benefits besides cost and convenience (an adult BP will have to eat a bunch of mice vs 1 or 2 larger rats)
I start my BP's on a 4 day feeding schedule... then move them to an 8 day feeding schedule around 600 grams