I'm very sorry for your frogs death . They like day warm day temps of 85F; but 90F is too high and could have contributed to death. Keep offering crickets to survivor and if want to try force feeding (last resort thing) get some Fluker's Repta Boost.

You can also offer highly nutritious night crawlers to your Pacman (from Walmart's sport section, get the un-dyed kind). Earthworms length should be around same as frog SVL. You can cut from pointy end if required and they can also be rinsed in dechlorinated water, pat dry in paper towel, and dusted in bowl before feeding. Good luck and keep us up to day on feeding efforts .