Is there a problem

[am_i_a_newt]

Hey there. I have a question. I recently bought some mealworms for my two toads, they've never been fed these before so i thought i'd give them a try . The thing is now the two toads have found a corner and "puffed" themselves up. I was wondering if this is due to the mealworms? If it is i probably shoudln't feed these again. Thanks for your help in advance