Yes you need to try to feed the crickets some bananas or apples or bird or fish food. If you feed the crickets they will become better for the toad to eat. I'd say at the most just 10 would be enough because you could make the toad really fat and it could become a health problem if it's too heavy. If you would feed it worms that would be healthier for the toad anyway and they are easier to keep but you do need the worms and or crickets to give the toad a balanced and healthy diet. The more I see the toad the more it looks like a female

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If you run your hand gently down it's back and it makes a chirping noise it's a male but if it's silent it's a female.