If you've added pets to the Menagerie you should be able to charm them back from the Menagerie.
Zaishen Menagerie Grounds - Guild Wars Wiki (GWW)
wiki.guildwars.com
Charming
- You can search the grounds and find an unlocked charmable animal at tier 1 and charm it.
- Wynn (Zaishen Training Captain) will spawn 4 identical charmable animals of any unlocked charmable animal/tier 2 and above on your account, letting you charm one.
Wynn should be able to spawn your Tiger that you added at lvl 15.
Any pets that were below lvl 12 you'll have to search the grounds to find the location.
"Currency" to do with unlocking are only if you haven't added a pet to the Menagerie and need to unlock it to make it available.
The only other "Currency" is to 'level up' the tiers of pets available to Tame, but most people just charm low/starter level Pets and then death-level them in the Menagerie.