.... and that is why i really dislike how some vets are sending meds just in case without actual problem....

Frogs are very sensitive creatures and without indication any meds should never be given!

Caspian you can't rule out anything until fecal exam is done, you can't visually tell whatever that is without an actual test. if your frog has pinworms/roundworms it is pretty nasty and long process to get rid of them, requiring very strict treatment plan and quarantine. it might become nightmare to get rid of them. tapeworms are easy to get rid of unless a frog is a intermediate host. again only vet can confirm that.

i know what kind of crickets that might have been, i've seen them in vancouver stores, jamaican giant crickets, they're bad, have very strong jaws and might very seriously injure a frog.

anyhow, i think you should do a test asap and go from there. good you have exotic vet nearby!