I found good way to farm them. At some point i want even make some YT tutorial but meh.
Anyway the idea is to pick up 3 star Village quest "Save Our Boat". Get some good weapon and start. As soon as quest begin go straight to zone 2. You have 4 Felynes staying right in the center of the location. Kill them, collect. After few seconds another 3 will spawn. Kill, collect. At the same time R. Ludroth will enter zone 2. If you get at least one Pawprint Stamp kill R. Ludroth to finish quest (few seconds with good weapon really). If you're out of luck just abandon after you kill 7th cat.
That way you can gather Pawprint Stamps pretty quick and also get your hands on some extra Dash Extracts for juices. I got my Master Kettleblower and Felyne Fatality in 2 hours or so.
There might be better quest or faster method of collecting them but this^ just work out for me so i share.