After it heals your tame you have to feed it

Best way to tame, use a bloodpack on yourself so it heals you then just feed it to get his energy back

the easiest way to tame a Tidepup is just to bring a small dino that you can safely injure a little, walk it over to the Tidepup, and let the little guy heal it. Every time it finishes healing your dino, you get a chunk of taming progress. Then you just wait for the Tidepup to chill for a bit, hurt your dino again (not too much), and repeat the process. It’s super low‑stress since the Tidepup doesn’t get aggressive or anything, so you can take your time and just cycle the heal → rest → heal loop until it’s yours.

Thses cute little creatures will be healers in wild and they will still be able to heal in the wild which is how there tamed