Tinykin

Each room in the house contains a bunch of candles (typically around 10, give or two) that need to be lit. They look like white balls with red spikes sticking out, and you need to throw a red tinykin at them to destroy it so the candle lights up. Lighting a candle gives you some pollen, and lighting all candles in a room gives you a large 50-pollen cluster to collect. You will more than likely easily find all candles in each room while exploring and collecting all pollen and tinykin. They're virtually always mounted on walls in areas you'll be traversing.

If you're missing any, refer to the pollen-related achievements in the guide below for each room. Each of those contains a video guide for all pollen locations, and the videos' Youtube descriptions have timestamps for everything, including all candles in every room.