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Iggy Koopa is the first boss of the game. He will attack by throwing you Goombas and Bob-ombs. He will also try to stomp you. To defeat him, jump on him, and he will spin inside his shell. Do that 3 times and you have beaten Iggy Koopa.
Boom Boom is the second mini-boss of the game. He will attack by spinning around, making his arms and hands weapons, like in some previous games. To defeat him, either jump on him while he is spinning or when he gets dizzy and falls. He will spin inside his shell. Do that 3 times and you have beaten Boom Boom.